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[[quoteright:347:http://static.tvtropes.org/pmwiki/pub/images/Arm_Cannon_5_3272.png]]
[[caption-width-right:347:[[VideoGame/{{Metroid}} Samus]] and [[Franchise/{{Transformers}} Megatron]] want you to have a blast.]]

->''An arm cannon sounds great until you need to button your shirt.''
-->-- ''AtomicRobo points out the flaws in this type of equipment''

A specific type of ArtificialLimbs that's ExactlyWhatItSaysOnTheTin: a ranged weapon integrated with a character's arm.

There are two general types. One is the complete replacement of a hand, or even an entire arm, with a gun. [[FridgeLogic Realistically]], these make very little sense, as getting an ArtificialLimb would allow you to ''hold'' a gun, and do other mundane tasks with the limb when you're not in combat. Arm Cannons that fully replace the limb are also prone to suffering {{Fake Arm Disarm}}s, as they can be destroyed without gravely injuring the wielder. A specialised version is a robotic hand that ''turns into a gun''. This version often overlaps with the HandBlast trope.

The other, more mundane version, is simply a gun that's attached to the arm - generally with the hand still intact. This might also involve ArtificialLimbs, but just as often uses a special harness or weaponised vambrace. Occasionally, the weapon may fit ''over'' the forearm and hand, giving the appearance of the first kind. More discreet versions often overlap with NothingUpMySleeve. Aiming it is usually a simple matter of pointing in the general direction of whatever it is you want to shoot. Using your free arm to brace the cannon before firing is optional, partly because reducing weapon sway and/or recoil improves your accuracy, but mostly because it makes the resulting shot look [[WaveMotionGun more powerful]] (or at least [[RuleOfCool more awesome]]).

Both kinds generally come with BottomlessMagazines, and are often fired by [[UnusualUserInterface thought alone]]. Larger versions of both types are common on HumongousMecha, which can be conveniently designed to carry them from the start.

For a weaponised arm that ''isn't'' a gun, see PowerFist, RocketPunch, and especially BladeBelowTheShoulder (and sometimes PileBunker). Not to be confused with HandCannon. Or, for that matter, ArmedWithCanon. Compare ShoulderCannon, LegCannon, and HandBlast. FingerFirearms is a small subtrope.

----
!!Examples:

[[foldercontrol]]

!!First Kind (arm ''is'' cannon)

[[folder:Anime & Manga]]
* ''Anime/DragonBallZ'': Android 16 had two cannons called "Hell Blasters" in his upper arms. In order to use them, he had to remove his forearms, usually holding them in his armpits. It helps that his forearms can also be used for a RocketPunch.
** In ''Manga/DragonBall'', villain Tao Pai Pai also got an Arm Cannon after being cybernetized.
* 004/Albert Heidrich from ''{{Cyborg 009}}'' looks normal, but as part of his cyborgization process all his limbs were replaced and now contain variable quantities of armament. The most remarkable are his finger guns (take that literally) and the rocket-launcher in his knees.
** Not to mention, in older continuities he actually has ''a nuclear bomb stored in his stomach''. [[spoiler: Which he's willing to use in a suicidal attack in TheMovie. He lives to tell, though.]]
* ''Anime/AstroBoy'' in the 2003 series. Before that, he had rocket hands, but rarely used them, as his weapon of choice was instead a pair of machine guns that popped out of his tush.
** Remake ''{{Pluto}}'' also has Gesicht, whose hands turn into cannons (one shoots non-lethal gas, the other shoots a powerful shell). Another robot, North Mk. II, cheats a little by having extra limbs devoted to his weapons.
* ''Anime/MazingerZ'', other than [[RocketPunch shooting its fists]], hid a cannon in each upper arm shot drilling missiles. Several [[{{Robeast}} Mechanical Beasts]] had cannons (or even machine guns like Balkan P5) instead of limbs. An example stands out is Debira X1 (a beast seemed a blend between bat and vampire) had a hidden leg cannon (and blew one whole Mazinger's arm off with it).
* ''Anime/RobotRomanceTrilogy'':
** ''Anime/CombattlerV'': Combattler-V is the king os this trope among HumongousMecha. He is equipped with Atomic Burner (its hands withdraw inside its arms and are replaced with a flamethrower), Rock Fighter (it shoots missiles from its fingers) and Battle Guleggar (Combattler releases a chain with metal collar from the arms, used for grabbing opponents by the neck).
** ''Anime/VoltesV'': Voltes Bazooka. The entire weapon is hidden in his right arm, and is deployed by tilting the right hand downward (which also becomes the weapon's grip held by the left hand) allowing the barrel to telescope out of the arm.
** ''Anime/{{Daimos}}'': Daimos has the Daimos Chain Shark, two chains with a hook shoot from above Daimos' hands. They can be used to deal damage or to drag the enemy.
* An early ''Manga/CityHunter'' villain had a machine gun replacing his right arm. After being defeated and mocked by Ryo, [[UpToEleven he took this trope up to eleven]], [[spoiler:and grafted a cannon in his leg.]]
* Hyūgo Kujiranami in ''Manga/RurouniKenshin'' first uses an Armstrong Cannon for an arm, and then a GrenadeLauncher in his plot to get revenge on Kenshin for cutting off his arm and not killing him as a warrior should.
* Kazuhiko, the main character of the Creator/{{CLAMP}} manga ''{{Clover}}'', has a prosthetic arm that can transform into a weapon.
* Vash the Stampede in ''{{Trigun}}'' has something similar to this: his [[ArtificialLimbs Artificial Limb]] folds out into first a pistol, then later a submachine gun. By tapping into the plant power inside his revolver, each of his arms can also morph into something akin to a WaveMotionGun.
* Not very common in ''Anime/GhostInTheShellStandAloneComplex'' for most of the logical reasons. One of the few exceptions is a political assassin who has a shotgun built into her forearm. She cocks it by pulling back her own thumb, and it's modified to shoot a roll of gold coins into the target -- the target being [[KarmicDeath a wealthy plutocrat]].
** There is a second exception: in ''[[Anime/GhostInTheShell Innocence]]'', Batou reveals that he has a cannon (well, a single-shot large-caliber firearm) built ''into'' his arm.
** Similar to Batou's built-in arm cannon, a Russian KGB agent from the anime series sports a large-bore cannon built into her elbow. It is presumably a last-ditch weapon, as it is rather cumbersome to fire -- her forearm must fold backward on a hinge to expose the muzzle.
** Angelfeathers had a shotgun built into his wrist.
** Motoko Aramaki built a grenade launcher into her own arm.
* The [[GentlemanThief title hero]] of ''Manga/SpaceAdventureCobra'' has a beam weapon replacing his left arm, the "Psychogun", which fires beams powered by his psychic energy. When not in use, he covers it with a prosthetic arm and hand.
* Guts in ''Manga/{{Berserk}}'' has a SteamPunk [[ArtificialLimbs mechanical left hand]] with a gunpowder cannon under it, the original having been [[spoiler:chiseled off with a broken sword by Guts himself after it was caught in a demon's jaws during the Eclipse]]. To work it, he has to flip the hand up and pull out a lever buried in the side of the cannon. The arm also has a repeating crossbow built into it, which he uses for killing human foes and torturing fallen demons.
* Franky from ''Manga/OnePiece'' has a machinegun/cannon infinite-ammo combination in his left hand. His right hand extends on a chain and is very strong. Both hands are also impervious to normal damage... although those [[{{Fartillery}} are not the only weapons he has integrated into his body]].
** Early villain Wapol can morph his arms and tongue into cannons.
* Miyu in ''Anime/{{Mai-HiME}}'' and ''Anime/{{Mai-Otome}}'' can turn her arm into an energy gun and a flamethrower, in addition to having ''[[LegCannon knee]]'' [[LegCannon cannons]].
* In ''Anime/AfterWarGundamX'', the Leopard Gundam has a [[{{BFG}} damn huge gatling gun]] instead of a left arm. While its MidSeasonUpgrade, Leopard Gundam Destroy, has the second type of this trope, as a pair of slightly less huge gatlings mounted on both arms.
* After losing an arm (and an eye and a leg) in a NoOneCouldSurviveThat moment in ''[[Anime/MobileSuitGundamSeed Gundam SEED]]'', Andrew Waltfeld appears in the sequel series ''[[Anime/MobileSuitGundamSeedDestiny Gundam SEED Destiny]]'' sporting a prosthetic replacement which, in a pinch, turns out to have a gun built into the wrist, revealed by partly detaching the hand.
* [=RizeGreymon=] in ''Anime/DigimonSavers'' had a huge revolver arm transformed from his Rookie form's wrist straps.
** Omnimon has an arm cannon too, naturally from the [[MacrossMissileMassacre MetalGarurumon]] side of him. It's utilized for his attack/technique called Supreme Cannon (known as ''Garuru Cannon'' in Japanese).
* The protagonists of ''{{Ayakashi}}'' and ''LightNovel/MushiUta'' have organic arm cannons. For the former, he normally has a Power Fist, but in the finale, his arm mutated into a dragon cannon. For the latter, his [[BondCreatures Bond Creature]] attached to his gun, and as the influence from the merger spread, it mutated his arm and, near the end, most of his body.
* In an episode of ''Manga/FullmetalAlchemist'', one character is seen cleaning (or polishing or something) an unused arm canon. And a much earlier episode featured a man with an "arm gun". Winry also mentioned that she learned how to make an auto-mail Machine gun, causing Ed to ask her if she's a MadScientist.
** Panynia has a leg cannon.
** On top of that, both Edward and Wrath ([[Anime/FullmetalAlchemist 2003 anime version]]) have transmuted their arms to machine guns.
*** Anyone wondering where he gets the ammunition for it?
** In the flashbacks to the Ishval campaign, Brigadier General Basque Gran uses a Philosopher's Stone and suddenly has cannons sticking out of his everywhere.
** A one shot videogame/Filler villain used an automail arm with a double barrel gattling gun, he heavily implied that he had them cut off and replaced intentionally to be a more effective soldier.
* A character in episode 3 of ''SamuraiSeven'' had a drop-down gun in his arm that fires big needles from a revolver-like chamber. It was fired by flexing the wrist.
* The Jeeg Bazooka was, in the anime ''KotetsuJeeg'', a fairly large bazooka that replaced his arm. In ''Koutetsushin Jeeg'', it becomes large enough for him to "hide" in -- a BFG.
* After a [[MidSeasonUpgrade major upgrade]], Chachamaru of ''MahouSenseiNegima'' now sports one of these.
** Sayo also gained one after Haruna made her a robot body.
* The cyborg Talos from ''LightNovel/CrusherJoe'' has a prosthetic arm with a built-in machine gun and a prosthetic hand that fits on the end, concealing the gun from enemies.
* In ''Manga/YuYuHakusho'', [[spoiler: when Sensui switches to his Kazuya personality]], his left hand morphs into a gun.
* [[NightOfTheLivingMooks The Mariage]] from ''[=StrikerS=] Sound Stage X'' of the ''MagicalGirlLyricalNanoha'' franchise. [[ShapeshifterWeapon One of the many forms their arms can take]] is a [[ThereIsNoKillLikeOverkill high-explosive howitzer-style cannon]] which one of them used on an unprepared mage. [[spoiler:Since the mage was [[SuperPrototype Subaru]], [[SmokeShield It doesn't work]]]].
* [[DGrayMan Allen Walker]] can turn his (non-artificial) left arm into a cannon that shoots a sort of paling projectile.
* As mentioned in ArtificialLimbs, one of Rally Vincent's recurring enemies in the manga series of GunsmithCats is a tall imposing man named Gray. He lost his hand in their first encounter and replaced his entire forearm with a multi-tooled Arm Cannon. Attachments included a hook and spring-launched machete.
* The Type 99 Helldiver military labor from ''{{Patlabor}}'' mounts a 40mm autocannon on its right arm.
* Guu from ''[[JungleWaItsumoHaleNochiGuu Haré+Guu]]'' can change one of her arms into a Gatling gun (complete with spent shells popping out of her mouth). Like the rest of Guu, it's inexplicable.
* In ''Manga/{{Bleach}}'', [[spoiler: [[{{Ninja}} Soi Fon]]'s [[EmpathicWeapon zanpakutou]]]] brings her under this trope for short periods of time. [[spoiler: In [[TouchOfDeath shikai]], her [[ImpossiblyCoolWeapon zanpakutou]] integrates with a finger on her right hand to turn her into the [[LightningBruiser ultimate two-hit kill warrior]].]] However, in [[spoiler: [[FinishingMove bankai]], her [[{{BFG}} zanpakutou]]]] becomes a [[spoiler: [[NukeEm stinger]] [[StuffBlowingUp missile]] [[ThereIsNoKillLikeOverkill launcher]]]] that is integrated with her entire right arm to turn her into [[spoiler: the [[OneHitKill ultimate one-hit kill warrior]].]]
* The gun-swordsmen in ''BrigadoonMarinAndMelan'' have a gun at the end of one arm and a sword at the end of the other, hence the name. They also have a second set of odd-looking retractable arms, which have stubby hands that they use for holding things.
* ''{{Nichijou}}'': [[RidiculouslyHumanRobot Nano]] has a machine gun in her right arm, [[AbnormalAmmo which shoots beans]]. This is only PlayedForLaughs, though, and never used seriously.
* ''NurarihyonNoMago'': Yura Keikain's shikigami Rentei transforms into one in Yura's arm that shoots a powerful stream of water.
* The Golem girl of ''Manga/DeadlineSummonner'' has a cannon built into her [[PowerFist massive robot hands.]]
* The Golem girls of Eita Touga's army have this alongside their {{power fist}}s and the [[HumongousMecha massive suits of armour they can pilot.]]
* Gordeau has one in ''Anime/LupinIIIIslandOfAssassins''.
* Both Ken and Ryuuichi from Manga/SnowWhiteAndSevenDwarfs have this ability.
[[/folder]]

[[folder:Arts]]
* In the art book ''Drawing and Painting the Undead'', one creature, the Mechanized Corpse, had it's left arm replaced with an M60 machine gun. The ammo belt [[{{squick}} replaced its stomach and intestines.]]
[[/folder]]

[[folder:Comic Books]]
* Comicbook/{{Cyborg}} of ''Comicbook/TeenTitans'' can transform one arm (both in some stories) into a "sonic cannon".
* In one of the many, many attempts by the DC writers to counteract the whole ''{{Superfriends}}'' [[WhatKindOfLamePowerIsHeartAnyway cock-up]], Comicbook/{{Aquaman}} had his arm chewed off by piranha when his powers were disabled. He got it replaced with a harpoon, and later a cybernetic hand that could morph into a harpoon gun. The hand was later replaced with one made of mystical water. Neither really helped much.
** [[http://media.comicvine.com/uploads/1/13925/294273-161009-aquaman_super.jpg Oh]] [[http://media.comicvine.com/uploads/0/8190/271516-53976-aquaman_super.jpg really]]?
** The [[JusticeLeagueUnlimited animated version]] actually ''cut his own arm off'' when chained up, [[PapaWolf in order to save his infant son]]. He gets the harpoon replacement and sticks with it throughout the series. [[CrowningMomentOfAwesome Can we say]] {{Badass}}?
* In another DC example, Guy Gardner (one of the many Comicbook/{{Green Lantern}}s) turned out to have an alien lineage that gave him the ability to shift his body into any weapon. [[DarkAge It was the Nineties, what can we say]].
* The [=KGBeast=], a Russian ''Franchise/{{Batman}}'' villain hacked off his arm and replaced it with a gun.
* The MarvelUniverse Villain Bushwacker can transform his right arm into a gun, thanks to CIA experiments preformed on him. He has to swallow bullets whole to provide ammunition.
* ''TheAmoryWars'': Coheed has his right arm end up one of these. It's quite possibly the most realistic power of all the Kilgannons. (Coheed's left arm has several curved blades that pop out of it, as well as being able to destroy stars; his wife, Cambria, has tele-everything [-kinesis, telepathy, clairvoyance...], their surviving child, their son Claudio, has natural star-killing abilities, and can aparently melt through walls. As well as clairvoyance.)
* Minor Comicbook/{{X-Men}} character Random had the power to turn his arms into protoplasm-firing guns.
* ComicBook/{{Deadshot}}, Franchise/{{Batman}} villain, sports two specially designed guns; one on each hand (the ammo belt goes around the wrist like a bracelet).
* The [=BATs=] (Battle Android Troopers) of ''GIJoe'' had a variety of arm cannons including machine guns and flamethrowers. Depending on the incarnation involved, they either had to be manually swapped out for hands, or transformed automatically.
* In the British comic ''StormForce'', John Storm had his left arm amputated above the elbow: he then carried around a rucksack full of prosthetic weapons, e.g. a machine gun arm and a flamethrower arm. He could also connect his stump to vehicles, e.g. a car or an aircraft, as long as they were designed for this.
* Another MarvelUniverse villain, Rapido, has a gatling gun mounted in place of his missing arm.
* And Marvel anti-hero cyborg DeathsHeadII has a very high tech right hand (from the future!) that can transform into, among other things, a BFG.
* In the ''ComicBook/TwoThousandAD'' series ''ComicBook/SinisterDexter'', the character Kal Cutter has a Mangapore skin-job replacing his right hand - when he points his hand like a gun and says "skin", his hand turns into a pistol. If he then says "hush" it grows a silencer.
* The ''Franchise/{{Transformers}}'' comics of Marvel, Dreamwave and IDW featured the chess master-type villain Shockwave, who not only sported a cannon as his left arm, but also transformed into a gun - making him a relatively rare example of EntireBodyCannon.
** Megatron (The original, G1-version) himself might also qualify in that, while his right arm technically wasn't a cannon on its own, his famous Fusion Cannon was permanently attached to it, making his right hand almost useless to do anything (except perhaps point at things).
* In the Marvel ''[[MarvelStarWars Star Wars]]'' comic book, there's Valance, a cyborg bounty hunter who predates Boba Fett. He had a blaster cannon fitted inside an artificial arm; it was powerful enough to take down a wall, and even come very close to killing Darth Vader himself.
* [[HollywoodCyborg Bunnie Rabbot]] from [[ComicBook/ArchieComicsSonicTheHedgehog Archie's Sonic The Hedgehog]] sports one. [[spoiler:However, since she is only partly cyborg, the power is drained [[AwesomeButImpractical straight from her life force]].]]
** [[spoiler: Recently, her cybernetic parts were magically returned to organic by [[EvilSorcerer Ixis Naugus]], which among other things means she no longer has one.]]
* The last issue of ''The Amazing Adventures of the Escapist'' doesn't feature the Escapist at all, but rather his Empire Comics stablemate Mr. Machine Gun. Mr. Machine Gun has a cybernetic hand that can turn into a powerful submachine gun, magazine included -- and he's a hero!
[[/folder]]

[[folder:Comic Strips]]
* ''ComicStrip/DickTracy'' villain Dr Plain had a small flamethrower built into his artificial arm.
[[/folder]]

[[folder:Fan Works]]
* [[spoiler: Alpha]] from ''FanFic/ClashOfTheElements'' has the ability to create one of these from both of his robotic arms. The primary function of them seems to be to shoot ionic energy in the form of a concentrated laser beam, but only time will tell if they are capable of shooting more.
[[/folder]]

[[folder:Films -- Animation]]
* Rattlesnake Jake from ''{{Rango}}'' has a gatling gun where his rattle should be. Instead of shaking his rattle as a warning, he spins the barrels. It's ''really'' creepy.
* Emperor Zurg in ''WesternAnimation/ToyStory2''.
* In Disney's ''TreasurePlanet'', Long John Silver was a cyborg and had an arm that transformed into a cannon at one point.
* EVE from ''WesternAnimation/{{WALL-E}}''. Like Mega Man, she can morph it from gun to hand, and even a little transitional mode which she uses most of the time. It's even detachable, and has an outside trigger which lets it be used by other characters as a conventional weapon. [[spoiler:Darn it, WALL-E.]]
[[/folder]]

[[folder:Films -- Live-Action]]
* In ''Film/RoboCop3'', the eponymous hero got an upgrade: he can now detach one of his forearms and attach a combination machine gun, flamethrower, and rocket launcher when he knows he's facing a serious firefight. Or when he's just plain pissed off.
* The T-X in ''Film/Terminator3RiseOfTheMachines'' can turn its arm into an energy gun and a flamethrower, among other weapons.
* After his transformation is complete, [[spoiler:Max]] in ''Film/{{Videodrome}}'' combines this with OrganicTechnology, [[WorldOfSymbolism among]] [[MindScrew other tropes.]]
* In the 2007 ''Film/{{Transformers}}'' film, Megatron turns his arms into a huge cannon!
** Megatron in ''Film/TransformersRevengeOfTheFallen'' has had his cannon integrated into one arm this time, also including a vicious blade weapon.
** All the Transformers, really. With few exceptions, the Autobots and Decepticons convert their arms into guns, swords, and other weapons, in order to avert the use of {{Hammerspace}}. This is sometimes described as them "generating" the weapon out of the protoform.
* The heroine of the Japanese film ''Kataude mashin g?'' (a.k.a. ''Film/TheMachineGirl'') is tortured and has her arm cut off by the Yakuza. The owners of a machine shop who rescue her replace it with a machine gun.
* PlayedForLaughs in the ''Film/{{Grindhouse}}'' film ''Film/PlanetTerror'' where a one-legged stripper has a machine rifle attached as her other leg. She is amazingly skilled with it.
[[/folder]]

[[folder:Literature]]
* DavidWeber's ''Literature/HonorHarrington'' had a pulser (hypervelocity needle launcher) built into her cybernetic arm as a holdout/emergency weapon. She needs a fingertip replaced whenever she uses it, but it does the job of a hand well enough and is almost impossible to spot.
* The Cobra cyborg warriors in Creator/TimothyZahn's ''Literature/TheCobraTrilogy''. Each Cobra warrior (the good guys, by the way) has a laser built into each hand, a powerful shock launcher capable of frying electrical equipment, and a tank-killer class laser built into their leg. All without any external cues that would indicate their augmentation.
* In ''TheOregonFiles'', Juan Cabrillo, the leader of a team of heroic mercenaries, has a high-caliber pistol built into a false foot -- in addition to a number of other goodies, making it something of a Swiss Army Foot.
* Aside from many obvious instances mounted on the HumongousMecha of the setting, two separate characters (who never actually meet) in the ''BattleTech'' Warrior trilogy have custom laser weapons built into their prosthetic forearms. One of them finds his rather handy a couple of times when no other gun is available and just slugging an opponent with his metal fist isn't an option; the other never actually gets the chance to use his because when finally confronted with a would-be assassin, the latter reveals that [[spoiler:he'd already infiltrated his victim's home days before and among other things made sure to drain the weapon's power cell]].
* The ''Franchise/StarWars'' [[Franchise/StarWarsExpandedUniverse Expanded Universe]] includes a type of four-armed nanny droid with blasters hidden beneath detachable hands on two of the arms. They're intended for the kidnapping-vulnerable children of politicians and such. Leia's custom-modified model for her son Anakin included this function on all four arms.
* Max Barry's ''MachineMan'' equips [[spoiler:Dr. Charles Neumann]] with one after he's become a ManInTheMachine. It's intended to be the first of an entire line of weaponry for {{Super Soldier}}s.
[[/folder]]

[[folder:Live-Action TV]]
* ''Series/BabylonFive'': The episode “Infection” has an alien organic weapon which takes over a human and gives their body armor and an Arm Cannon.
* ''Series/BattlestarGalacticaReimagined'': Cylon Centurions from the re-imagined show have hands that transform into guns. Additionally, said hands are apparently bladed, as seen in one particularly ugly moment during an early sequence of the second season.
* ''Series/BlakesSeven'': [[TheDragon Travis]] has an artificial left hand with a gun built into it.
* ''Series/BuffyTheVampireSlayer'': Adam, in season 4, has both a mini-gun and a grenade launcher built into his arm.
* ''{{Cleopatra 2525}}'': The Betrayers are robots disguised a humans whose arms can turn into laser cannons. Their creators - giant machines called Baileys, can also deploy arm-like appendages that fire energy bolts.
* ''Series/DoctorWho'':
** Autons (of the shop window dummy variety) have guns built into their right hands, which drop open to fire.
** Although they hardly use them, so do the alternate universe Cybermen. Their original universe counterparts just carried guns.
** [[spoiler: Rory]] in The Pandorica Opens and The Big Bang.
** The Gunslinger in A Town Called Mercy.
* ''Series/KamenRiderDenO'': Deneb gives this an odd twist: his individual fingers are guns. When he merges with his partner Yuuto to form Kamen Rider Zeronos Vega Form, his hands turn into shoulder-mounted machineguns.
* ''Series/KamenRiderV3'':
** Riderman was notable for being a Rider whose only technological augmentation was his right arm, and just for that, he ''still'' threw down more than any regular human ought to be able to. The arm itself could change somehow, through cassette cartridges inserted in his right elbow, into various forms (a drill, a claw, a net launcher, the ''original'' Hookshot...) but it wasn't until he showed up in ''Manga/KamenRiderSPIRITS'' that he got a proper ''gun''. And how! A proper Machinegun Arm that could, in a pinch, fire individual shells; seeing as how he just didn't have the firepower to take down some of his foes, these shells were ''hardening agents'', on the theory that, if they couldn't attack him, he didn't actually need to blow them up.
** The first ''Series/KamenRiderDecade'' movie gives Riderman (played here by Music/{{Gackt}}) the Blaster Arm, a high-power energy cannon. However, unlike his others, he actually has to '''tear off''' his original cybernetic arm and attach the Blaster to the severed stump in order to use it.
* ''Series/{{Revolution}}'': Charlie gets one in [[Recap/RevolutionS1E2ChainedHeat Episode 2]], but it's highly inaccurate and only works once.
[[/folder]]

[[folder:Music]]
* VideoGame music band [[http://armcannon.com/ Arm Cannon]] warrants a mention. Fittingly, the first track of their first album is from ''VideoGame/{{Metroid}}'', and the second is from ''VideoGame/MegaMan3''.
[[/folder]]

[[folder:Pinballs]]
* The T-X from ''Pinball/Terminator3RiseOfTheMachines'' has a Plasma Cannon in her left arm. She uses it to launch pinballs at the player.
* The protagonist of "Space Sister" in ''VideoGame/SuperPinballIITheAmazingOdyssey'' has one. Justified in that she is a CaptainErsatz of [[Franchise/{{Metroid}} Samus Aran]].
[[/folder]]

[[folder:Tabletop Games]]
* In ''{{Mortasheen}}'', the creature [[http://www.bogleech.com/mortasheen/smoldron.htm Smoldron]] has a ''flamethrower'' version of this.
* Many Battlemechs in ''BattleTech'' mount a large gun where a hand would be, and leave the other arm free with a hand. Many other 'mechs do this with ''both'' arms, turning the 'mech into a dedicated firing platform at the cost of melee combat ability.
* The Obliterator cult from ''TabletopGame/{{Warhammer 40000}}'' is a cult of extremely chaos-mutated [[SuperSoldier space marines]] whose bodies have been literally fused to their own weaponry and armour, allowing them to morph their warped body parts (with arms being preferred) into various types of {{BFG}}s at will, literally turning themselves into walking humanoid heavy weapon platforms. The question of where the ammo to these weapons are kept is, perhaps, better left unasked.
** It's implied that Obliterators can access the Warp and use its energy to power their weapons. They also don't have kinetic-energy weapons anymore, so there's no point wondering where they store the ammo for heavy bolters or autocannons.
*** ''Inquisitor'' specified that they produce their own ammunition as a result of their encounter with TheVirus.
** Tau Battlesuits use this setup a fair bit as well, when they aren't shoulder-mounting it.
** Tyranid weapons are all organic parts of the wielder's body, but luckily [[MultiArmedAndDangerous they have backup arms]]...
** Combat servitors have had one or both of their arms replaced by weaponry of one sort or another.
* Meanwhile, over in ''TabletopGame/{{Warhammer}}'', you've got the Skaven warlock Ikit Claw, so named because in place of one arm he's got a MagiTech prosthesis. With a built-in [[KillItWithFire warpfire thrower]].
* The ''TabletopGame/{{Shadowrun}}'' RPG offers these as a type of cyberware. The end of the gun is in the palm, and locking one's hand back links it to the rest of the gun barrel. Rarely used as typically not worth the cost or essence, it does allow one to use their hand though. There was also a picture of a character with the more traditional gun as a hand in the older Critter's book.
* Though there are no official "standard" magic items to do such, creating a component for a warforged (from ''[[TabletopGame/DungeonsAndDragons Dungeons & Dragons]]''' {{Eberron}} campaign setting) that did something similar would be a matter of upgrading the damage an arm''bow'' could cause. In 4E a crossbow can be embedded with the "Armbow" enchantment; the main perk is not having to worry about reloading.
* Alchemical ''{{Exalted}}'' can get a Charm installed that allows them to turn their arm into a gun that fires pure Essence, as demonstrated [[http://keychain.patternspider.net/archive/koc0137.html here]] by [[KeychainOfCreation Elegant Nova of Progression]].
** In second edition this was removed from their core Charms and became an Ink Monkeys aftermarket upgrade; while it still took a Charm slot, that selfsame Charm could be expanded to produce a secondary "siege devastator" mode, a sword, or any other piece of kit you could reasonably fit within an Alchemical's body.
* The post-Steampunk roleplaying game ''{{Etherscope}}'' includes rules for both cybernaughtic (i.e. robotic) arms and integrated weaponry, allowing a character at second level to integrate a pistol, or even a ''miniaturized grenade launcher'' into their arms. This troper is currently playing a character whose pair of robot arms contain said grenade launcher, a large autocannon, and a ''steam-powered [[ChainsawGood chainsaw]]''.
* The collectible miniatures game ''{{Monsterpocalypse}}'' includes Rogzor of the Planet Eaters, who has ''two'' arm cannons.
* ''{{GURPS}}: ''At least one version of the ''Ultra-Tech'' supplement lets a gun be implanted inside a character's hand or arm. Alternately the entire arm can just be replaced with a weapon mount.
* ''MechWarrior'', the tabletop roleplaying companion game to the ''BattleTech'' tactical game, allowed any character who needed an artificial limb to replace one that they'd lost to also install special equipment in said replacement. Naturally, concealed weapons were included, ranging from the somewhat feasible (such as a hold-out pistol hidden in the wrist) to the highly unlikely (like an ''entire laser rifle'' built into the forearm). The rules didn't explicitly deny the inclusion of any weapons beyond GameMaster fiat, and if a GM wasn't paying attention or didn't care, this could lead to things such as concealed double-barrel shotguns, concealed Gauss pistols, or ''concealed anti-'Mech rocket launchers''.
* Arm cannons are an available Technocracy implant in ''MageTheAscension'', either a small but concealable one, or a large and obvious one. Notably, [[RequiredSecondaryPowers you're required to get the skeletal reinforcement implant before getting one]], and since plasma cannons are both blatantly obvious and ''not'' considered real by [[YourMindMakesItReal the vast majority of humanity]], Paradox makes them dangerous to use on a metaphysical level, as well.
[[/folder]]

[[folder:Toys]]
* {{LEGO}}:
** ''Franchise/{{Bionicle}}'''s Exo-Toa armor (in place of a hand), Hydraxon (attached to the arm) and Hewkii Mahri (attached to the arm, but he lacks a hand anyways).
** Numerous mechs from ''{{LEGO Exo-Force}}''.
[[/folder]]

[[folder:Video Games]]
* Barret in ''VideoGame/FinalFantasyVII'' switched his prosthetic arm to a gun when he got permanently pissed off, and [[SwissArmyAppendage changes back in supplementary materials once he's done.]]
** In ''AdventChildren'' he upgraded to a cybernetic arm that can [[MorphWeapon shift]] to a Gatling gun '''or''' a particle beam cannon.
* Jack in ''ArTonelico'' has his left arm (and most of his torso) converted into machinery, with his arm doubling as a gatling gun. Of course, he only uses it in his powered-up state, and normally just fires a pistol that he holds in his right hand.
* ''VideoGame/MegaManClassic'' in many incarnations. All versions justify this by having his arm morph from the cannon to a regular hand.
** Zero has a transforming handheld [[SwissArmyWeapon saber, shield, pogo lance, hookshot, and tonfas]], and a looted energy pistol. It doesn't stop him from using the Z-knuckle to graft enemy turrets and flamethrowers onto his arm, classic-style, in the fourth game.
** And on the subject of ''VideoGame/MegaManZero'', Fighting Fefnir. By extension, Model F users in ''ZX'', which actually falls into the second category.
*** Model FX users just have [[HandCannon Hand Cannons]] [[GunsAkimbo Akimbo]].
** In the ''VideoGame/MegaManX'' series, Zero's arm cannon is actually of the second type, emerging from his forearm. Odd that it switched over between series, but whatcha gonna do?
*** Because he lost his body at the TimeSkip between the ''X'' and ''Zero'' series. The so-called Z-Buster is a pistol he grabbed off a dead RedShirt to fight the Pantheons.
* Wild Dog in the ''VideoGame/TimeCrisis'' games. He replaces the arm he lost in the first game with a machine gun, he adds a flamethrower and a rocket launcher in the third game, and in fourth game he adds a grappling hook and a tractor beam.
* In ''VideoGame/{{Persona 3}}'' Aigis gets the deluxe version: Many of her equippable weapons (including her starting one) feature an Arm Cannon that allows her to fire bullets from her fingertips.
* Forcystus in ''VideoGame/TalesOfSymphonia'' has one of these; it's never explained how he got it, since he's a minor boss villain, but given that he wears an eyepatch as well, it's likely a replacement for a battle injury.
* In ''VideoGame/SuperMarioRPG'', all weapons equippable by Geno have to do with some sort of gun. Standard guns shoot from his fingertip, his punches launch his forearms at the enemy, and one weapon, the "Hand Cannon", actually shoots canonballs from his elbow.
* The towering Cyberdemon from ''VideoGame/{{Doom}}'' has a rocket launcher instead of his left forearm, and the grotesquely obese mancubus from ''Doom 2'' has both of his hands replaced by rockets as well.
* The Rifle Demons in the ''Franchise/{{Disgaea}}'' series have arm cannons that fire energy blasts and can also generate a TractorBeam and LaserBlade in some of the games.
* In the ''VideoGame/ArmoredCore'' series, arms with integrated weapons are possible part selections for your HumongousMecha. Practically every type of weapon is available -- arm machine guns, arm beam swords, arm beam cannons, arm ''bazookas''... Weapon arms are much more weight- and energy-efficient than hands holding guns, though less destructive and less versatile. This doesn't stop the EKLAKH machine gun arms from ripping whatever they target to pieces.
* The Franchise/{{Pokemon}} Rhyperior has holes in its palms that serve as cannons; it shoves rocks and the rare Geodude down the holes and shoots them. This is how it uses its signature move Rock Wrecker (Rock Cannon in Japanese).
** Magmortar does this too. You can see it at the beginning of ''[[TheMovie Giratina and the Sky Warrior]]''.
* All Weapons wielded By heavy armour in ''VideoGame/{{Dystopia}}.''
* In ''[[{{VideoGame/Tribes}} Tribes: Vengeance]]''. All Weapons For Heavy Armour are in the Arm cannon Variant
* KOS-MOS from the ''VideoGame/{{Xenosaga}}'' series. It's usually just a regular arm, but she morphs it into an arm cannon for her R-Cannon attack.
* Hunters from ''Franchise/{{Halo}}'' have a ''fuel rod cannon'' (Covenant Rocket Launcher) attached in place of a right arm. At least they seem to use the left one to fire
* [[ThoseWackyNazis Several bosses]] from ''VideoGame/Wolfenstein3D'' have arm cannons, such as the Grosse Family and [[StupidJetpackHitler Adolf Hitler]].
* At the end of ''VideoGame/MetalGearSolid'', Gray Fox shows up wielding a laser cannon arm; with absolutely no explanation as to where it came from.
* The Russian cybernetic supersoldier Volkov from ''VideoGame/CommandAndConquer: Red Alert'' has his arm turned into a tank cannon. Depending on the level, he may use a silenced pistol instead.
** Also Cyborgs in ''Tiberian Sun'' and ''Kane's Wrath''.
* ''{{VideoGame/Yakuza}} Dead Souls'' has Ryuji Goda, whose right arm is replaced with a prosthetic that can transform into a [[GatlingGood gatling gun]].
* Reisen from the ''VideoGame/{{Touhou}}'' shooting game series is shown to fire her bullets straight out of her fingers (often with her hand in the classic [[FamilyFriendlyFirearms invisible gun]] pose).
** And Subterranean Animism gives us [[ILoveNuclearPower Utsuho Reiuji]], whose right forearm is a nuclear control rod capable of firing small suns. Though it wasn't confirm as an arm cannon until ''Hisoutensoku'', fandom nonetheless [[http://www.youtube.com/watch?v=p2H8pL8gTXo ran with it (skip to 2:00)]].
* In ''VideoGame/NarutoClashOfNinja Revolution 2'' (and other releases, most likely), the game-exclusive character Bando can detach one of his hands and attach a [[{{BFG}} Big Effin' Arm Cannon]].
* ''VideoGame/{{Fallout 3}}'' has Protectrons whose arms have integrated laser cannons. And of course the badass Sentrybots whose one arm is a gattling laser cannon while the other is a rocket launcher. ''"Hostile detected. Non-combatant safety can no longer be guaranteed."'' No shit...
* Grobyc (note the [[SdrawkcabName Sdrawkcab]] significance) from ''VideoGame/ChronoCross''.
* In ''VideoGame/MetalArmsGlitchInTheSystem'', '''every''' robot with a dedicated weapon has them built in (save for Guards). Most Mil enemies even have [[GunsAkimbo dual arm cannons]] (and in one case, [[UpToEleven QUADRUPLE]] arm cannons), were Mil Grunts and Droid Miners only replace one arm. Somewhat {{Justified| Trope}} in that they're, y'know, ''robots'' that are actually made to fight, and it makes sense to integrate the weapons into their frames. However, in the case of the Droids, it's implied that they even have Arm Tools, and that they can actually swap various weapons and tools out as needed (This also makes sense; it has the weapon/tool's fire control and power supply directly connected to the Droid it's attached to, while still allowing for modular versatility). Glitch is the only one who demonstrates this, however. He even has a little hand he can snap onto his arm in place of a weapon, although it it functionally useless.
* [[FourStarBadass General Warfield]] from ''{{Starcraft}} II: Wings of Liberty'' gets one of these after losing his arm to hydralisk venom. It transforms from fully-articulated arm and hand to built-in gun and back.
* Mondo Zappa, from ''KillerIsDead'', has a cybernetic left arm that can morph into a [[MoreDakka machine gun]], [[KillItWithIce ice blaster]], and [[WaveMotionGun charged cannon]].
* In ''SepterraCore'', the bounty hunter Ayram had a pair of arm ''missiles''. They even return after he fires them. He'd still rather have actual hands, though.
-->'''Ayram''': "If I had hands I could create as you do."
* The Barrelchest Mk II in ''{{Runescape}}'''s "A Clockwork Syringe" quest is equipped with a full-size gunpowder cannon in place of its left hand.
* ''VideoGame/SonicAdventure'': E-102 Gamma has one. His "brothers" Beta, Delta, and Epsilon each have two.
* John Cain, the main character of the obscure PS1 game ''VideoGame/{{One}}'', had his left arm forcefully replaced with one of these.
* In ''VideoGame/EvilDeadAFistfulOfBoomstick'', Ash Williams, as an extension of his [[ArtificialLimbs usage of right-hand replacement weapons]], can swap out his chainsaw hand for a gatling gun.
* In ''VideoGame/MassEffect3'', Cannibals, batarian-derived Husks use arm cannons that are actually ''human'' bodies grafted onto their own. It's a combination of a machine gun and grenade launcher.
** Scions are built around their massive arm cannon. In ''2'', it shoots an anti-infantry shockwave that deals heavy damage and knocks you out of cover. In ''3'', it's upgraded to a burst fire explosive energy cannon, that fires extremely accurate and powerful projectiles that do more damage than any other ranged attack in the entire game- including the anti-tank rockets Atlas Mechs shoot.
* ''SaintsRowTheThird'' the protagonist get's to use an Arm Cannon in the mission "http://deckers.die" and get to keep it after.
* Many Strogg enemies in the ''VideoGame/{{Quake}}'' series, one even has a driller-arm which can shoot lightning out of it.
* ''[[Videogame/TheKingOfFighters K9999]]'' possesses an arm cannon as part of his [[ShapeshifterWeapon transformation weapons]]
* In ''Videogame/TheReconstruction'' and ''Videogame/IMissTheSunrise'', Tezkhra is in possession of one. It runs on energy collection technology he designed himself, and part of the reason for adding it instead of a regular cybernetic arm was field test data.
* ''VideoGame/{{Bioforge}}'': One of the enhancements that the protagonist got as part of his UnwillingRoboticization. As the weapon is small and concealed, he doesn't even realize it for the longest time.
* Brad Fang of ''VideoGame/{{Contra}}: Hard Corps'' has a gun grafted onto his arm which can function as a machine gun, vulcan cannon, or flamethrower.
* ''VideoGame/{{SolForge}}'' card [[http://solforgewiki.forgewatch.com/wiki/Forgeplate_Sentry Forgeplate Sentry]] grows one at level 3.
* ''VideoGame/{{Evolva}}'': Switching into several of the weapons, like the Spore, makes the Genohunters' hands transform into this.
* ''VideoGame/GhostSongAJourneyOfHope'': In direct reference to [[Franchise/{{Metroid}} Samus Aran]], the protagonist's Deadsuit has one for a left hand. The fact that it cuts off at the wrist has disturbing implications for the person inside it.
* The [[FallenAngel Fallen]] in ''[[NexusWar Nexus Clash]]'' invert this trope and manufacture ''ammunition'' from one hand to fire it with the other. [[BodyHorror It hurts to do this]].
[[/folder]]

[[folder:Web Comics]]
* Reona from the webcomic ''Webcomic/{{Zap}}!'' lost her arm in the backstory, and had it replaced with a [[http://www.zapinspace.com/d/20070813.html retractable arm cannon]].
* Michelle Flammel from ''{{Monsterful}}'', when she fuses with her golem Ourox she gains the "Oux Cannon" which is able to fire concentrated "moe energy", the cannon has been shown to be able to upgrade itself, 2 versions have been shown so far, [[http://www.monsterful.com/chapter05page06.php 4k]] and [[http://www.monsterful.com/znp15-02.php 5k.]]
* The superhero Cannon from ''[[http://www.heroesofcrash.com/ Heroes of C.R.A.S.H.]]'' has one as his superpower.
* The Nemesite prison [[MechaMooks guard-bots]] in ''TheInexplicableAdventuresOfBob'' have gun arms. When [[CardCarryingVillain Fructose Riboflavin]] defeats them in his jailbreak, he removes their arms and mounts them on stands to use as {{BFG}}'s.
* All characters in ''BobAndGeorge'' based on the Mega Man sprite have the ability to morph their arm into a cannon. [[RunningGag Except George]].
* Clayton from ''Webcomic/ChaosTheory'' has a frigging ''minigun'' built into his robot arm after a weapons malfunction caused him to lose the original left one.
* Arlecchino from [[http://www.commedia2x00.wordpress.com Commedia 2X00]] has one. So far, he's only used it to blow up cantaloupes while bored, but it makes a PCHAO!! sound when he does it.
* In ''Webcomic/CommanderKitty'', Nin Wah's prosthetic arm was confiscated and ejected into space under the vague suspicion that it might have actually been one of these. [[spoiler: Turned out they were right.]]
--> Mittens: "[[http://www.commanderkitty.com/2010/07/25/whose-side-are-you-on/ Oh wow, neat!]]"
* In ''Webcomic/DemonFist'', Jacob's HookHand shoots out on a chain, as a combination grappling hook and harpoon.
[[/folder]]

[[folder:Web Original]]
* Two characters in ''Roleplay/DinoAttackRPG'' have an arm cannon. Dr. Cyborg's right arm becomes one when he switches into battle mode, and Sam Throramebi's prosthetic mechanical arm has a retractable hand that doubles as a plasma cannon.
* ''WebAnimation/QuirkyMisadventuresOfSoldineTheCyborg''
** The titular protagonist is equipped with a Black Box rocket launcher in the right hand and a large six-barrelled gatling gun in his left hand.
** His EvilKnockoff, Robosol, sports twin submachine guns.
* Mecha Sonic of ''SuperMarioBrosZ'' has a machine gun/missile launcher hidden in ''both'' arms (though he only ever uses one at a time).
[[/folder]]

[[folder:Western Animation]]
* Loads and loads of ''Franchise/{{Transformers}}'', though the original Megatron is probably the most prominent example.
** Honorable Mention goes to ''Beast Wars'' Megatron, who had '''two''' [[{{BFG}} ludicrously big arm cannons]] in his original form. They became the head and tail of his ''T. rex'' mode. Thankfully he could remove one of them to use his hand.
** Shockwave in ''Franchise/TransformersGeneration1'' has a blaster arm.
*** A trait that carries over to most incarnations of Shockwave.
** [[WesternAnimation/TransformersAnimated Animated]] Omega Supreme is another both-arms example. Of course, he was built to be the Autobots' war-ending PersonOfMassDestruction, and is the size of a skyscraper in any case: he's not going to be able to physically interact with most creatures.
** In ''WesternAnimation/TransformersPrime'', almost every Autobot has one or two of these, the only exception being Ratchet, who sticks to [[BladeBelowTheShoulder arm-mounted blades]].
* When [[spoiler:Lightning Lad]] of the ''WesternAnimation/LegionOfSuperHeroes'' AnimatedSeries has an arm blown off by BigBad Imperiex, it's replaced with a large mechanical replacement that can be used to channel and amplify his powers. [[spoiler: He's surprisingly okay with the loss of his limb. It probably has more to do, though, with finally getting his sister back than with the cool replacement.]]
* A video game section of ''WesternAnimation/{{Futurama}}'' parodies this trope by having the digital version character fire from their fingers, and in Fry's case, from his arm, which makes the sound of a shot gun cocking.
* Zachary Foxx from ''WesternAnimation/AdventuresOfTheGalaxyRangers'' has a bionic arm. It needs a bit of charge time before firing, making it an arm-sized WaveMotionGun more than an Arm Cannon. "Armada" showed it was capable of knocking a small starship off-course.
* Deadshot from ''WesternAnimation/BatmanGothamKnight''... complete with ''[[MoreDakka dakka]]''!
* In the ''WesternAnimation/TeenTitans'' animated series, Cyborg has weaponry in almost all of his appendages. No, he's ''not kidding'' about the shoe rocket. His sonic cannons remain his favorite weapon, though.
-->'''Cyborg''' ''(filking the theme song)'': ''If there's trouble you know what to do! Call Cyborg! He can shoot a rocket from his shoe!''
** Cyborg also sports two in ''DCSuperFriends''.
* In the AnimatedSeries of ''WesternAnimation/TheMask'', the titular character has a pirate form that has an appropriately-styled cannon replacing one arm.
* In ''WesternAnimation/CodeLyoko'', amongst XANA's monsters the "Tarantula" has two laser cannons stubs in lieu of arms (and legs too, though the latter are never seen in use). Its firing position is a crouch reminiscent of ''Franchise/StarWars''' Droidekas.
* The ''WesternAnimation/HeManAndTheMastersOfTheUniverse1983'' villain Hordak, also the BigBad from ''WesternAnimation/SheRaPrincessOfPower'', could transform at will his arm into a cannon - a prominent use of his VoluntaryShapeshifting skillset; he could also turn his whole body into a rocket. The 1980s comics had the exact style of this vary wildly DependingOnTheWriter - sometimes the cannon was wider, sometimes narrower; generally it was his whole arm to the shoulder that transformed, while with certain illustrators it was just his forearm. Whatever form it took, it always looked awesomely {{Badass}} - Skeletor never pulled off any trick like that...
* Easel from ''WesternAnimation/SkysurferStrikeForce''.
[[/folder]]

[[folder:Real Life]]
* There is at least one real-life example of a machinist building such a device, so a one-armed man could compete in target shooting. In a strange case of life imitating fiction, he was eventually barred from competing with the "arm cannon" because it made him such a good shot -- the gun was triggered by his opposite shoulder muscle and bolted on firmly, giving much more stability when firing than anyone could otherwise achieve.
* Jay J. Armes, because of an accident involving railroad explosives at the age of 7 both his hands were replaced with prosthetics. At some point a gun was attached.
** Who actually had his own [[http://www.journalofantiques.com/April07/playing_around.html action figure]] --
*** That can surely not be his real last name.
* A biological example: [[http://en.wikipedia.org/wiki/Alpheidae pistol shrimp.]]
[[/folder]]

----
!!Second Kind (arm-mounted cannon)

[[folder:Anime & Manga]]
* ''Anime/DragonBallZ'': Frieza's lowly soldiers in the Planet Trade organization often use small arm cannons, though usually to no avail against far stronger foes, as these guys are nothing but cannon fodder for the main characters. Seems like the main use for these weapons is to conserve those fighters' meager store of power.
* In ''TsubasaReservoirChronicle'', when the group first comes across a kudan gang war, the gang members are aiming their arms at each other while shooting off energy from just above their wrists, clearly meant to evoke the arm-mounted cannon.
* The Gundam "Alex" in ''Anime/MobileSuitGundam 0080: War in the Pocket'' has a [[GatlingGood Gatling gun]] hidden in each forearm, which came as a nasty surprise to the Zeon commando who tried to take it out.
** Likewise, the [[Anime/MobileFighterGGundam Shining Gundam]] has a pair of light beam guns on its arms.
** And before either of those, the [[Anime/MobileSuitZetaGundam Zeta Gundam]] had twin grenade launchers.
** In ''Gundam 00'', all of the Human Reform League's mobile suits either had an arm-mounted cannon, or a BFG and sensor array replacing the head
** And don't forget Gundam Wing's pre-redesign Gundam Heavyarms, which sported a massive Gatling gun on it's left arm... and two more in the chest-plates... not to mention the multiple rocket launchers everywhere they could fit them. MoreDakka AND MacrossMissileMassacre, anyone?
*** Post-redesign in Endless waltz switched the one gun on the left arm to -two- massive gatling guns on the right arm, and still keeping the rest of its armament.
* The Power Launchers in ''{{Heavy Metal L-Gaim}}'' are among these.
* Nove's [[PowerFist Gun Knuckle]] in ''MagicalGirlLyricalNanoha'', which was modified by [[MadScientist Jail]] to fire energy bullets like a machine gun as well.
* Absalom from ''Manga/OnePiece'' combines his invisibility powers with a pair of arm mounted bazookas to surprise his enemies.
* Gates from ''LightNovel/FullMetalPanic: The Second Raid'' might count. His Venom has a pair of machine guns on his back which swing forward beneath the armpits into a position where they can be aimed by hand.
* ''Manga/KatekyoHitmanReborn'': Gokudera obtains an arm-mounted cannon at the beginning of the Future Arc
* [[Anime/DigimonTamers Beelzemon]] gets a very impressive one, called "[[NamesToRunAwayFromReallyFast Death Slinger]]" and an equally impressive set of black wings in Blast Mode.
[[/folder]]

[[folder:Comic Books]]
* Franchise/TheDCU villain Deadshot typically gets into gunfights with a pair of wrist-mounted guns.
* ''ComicBook/ABCWarriors'': Hammerstein has several mounted on his left arm.
[[/folder]]

[[folder:Fan Works]]
* Jack from ''Fanfic/CalvinAndHobbesTheSeries'' gains this when his MoralityDial is switched.
[[/folder]]

[[folder:Films -- Animated]]
* Metalbeard in ''WesternAnimation/TheLEGOMovie'' has at least two of these mounted on his left arm. Note that these are ''literal'' powder-and-cannonball-based cannons!
[[/folder]]

[[folder:Films -- Live-Action]]
* The Film/{{Predator}} has a wrist-mounted launcher that can shoot out small, piercing ordinance, such as pincers, needles, or forked blades. Also of note is the [[ShoulderCannon shoulder-mounted plasma gun]].
* Super Battle Droids from the ''Franchise/StarWars'' prequel trilogy, of course. Their right wrists are equipped with blaster and small-caliber rocket launcher.
** Both Jango and Boba Fett. Jango in ''Film/AttackOfTheClones'' has a flamethrower on his arm. Boba uses a wrist blaster during the sail barge battle in ''Film/ReturnOfTheJedi''.
* Film/JamesBond gets one in ''Film/{{Moonraker}}''. It's easily concealed and fires darts tipped with either poison or explosives.
* The 1982 film ''Film/TheSoldier'' features a scene in which a character has a sawed-off shotgun strapped to his arm and hidden by his sleeve. When stopped by a policeman or security guard and asked to put his hands up, he complies... and uses the gun to shoot the guard in the chest.
* The aliens in ''Film/BattleLosAngeles'' have guns surgically attached to their arms, prompting the Marines to remark that they are ''committed'' to their cause.
* In ''Film/CowboysAndAliens'', The main character steals one in his escape from the Aliens, and the only thing that has a chance of damaging the Aliens.
** Interestingly, no one else tries to do the same.
* In ''Film/XMenDaysOfFuturePast'', the Prototype Sentinels have a wrist-mounted Gatling gun.
[[/folder]]

[[folder:Literature]]
* The Pyrrans in HarryHarrison's ''{{Deathworld}}'' are born into the losing side of a technology-vs-biology conflict that has an entire planet forcibly mutating to attack them. They train, from about the time they're old enough to walk, with forearm-mounted holsters which automatically slap a pistol into the wearer's hand when he or she positions the fingers for gripping the pistol's butt. If the fingers aren't crooked just right, the trigger finger may touch the trigger before the firer intends, which will cause problems if he or she didn't mean to shoot just yet. These are large-caliber pistols using live explosive rounds, making them exemplars not only of arm-cannons, but several other kinds of insanity as well.
* One of the first appearances of cybermancy in ''TabletopGame/{{Shadowrun}}'' was when three "Hellions" - heavily modified cyborgs - appeared in one of the novels. Each had a triple-barreled machine gun incorporated into one arm.
** The Hellions appeared in "Never Trust an Elf".
* One of the weapons used by the titular ''Fighters of Danveyt'', a novel by [[http://en.wikipedia.org/wiki/MikhailAkhmanov Mikhail Akhmanov]], is a fingerless glove that has various weapons "attached" to each finger. One of the most prominent weapons is the freezer, which creates a short-lived miniature black hole at the designated point, causing the temperature in the immediate vicinity to be dropped nearly instantly to extremely low levels (hence the name). For bonus points, there is also a [[MoreDakka rapid-fire version]] of the weapon.
** A character in the book had previously lost an arm in a war, so he replaced it with a prosthetic that has these weapons built into it, making this an example of the first case.
* One of the weapons used in the ''Death Zone'' novels set in the [[VideoGame/{{STALKER}} S.T.A.L.K.E.R.]] universe is the armgun - a powerful [[FrickinLaserBeams laser]] emitter mounted on the forearm. At full power, it can slice a [[NinjaPirateZombieRobot staltech]] in half.
* In Steve Perry's ''Literature/MatadorSeries'', the signature weapon of the Matadors (and Emile Khadaji, who inspired them) is the spetsdöd. It's a dart gun mounted on the back of the hand, and fired by extending your index finger and touching the barrel. All you have to do to shoot something is point at it. The darts are tiny, and thus technically nonlethal, but they can be loaded with nearly any sort of drug or poison.
* ''Literature/SpectralShadows'' has Princess Electra in Serial 2, who pretty much is a Mega Man type character, if only an animal character instead of a human.
[[/folder]]

[[folder:Live-Action TV]]
* The Kull Warriors from ''Series/StargateSG1'' have an energy weapon mounted on both arms, which is essentially a miniature, rapid-fire staff weapon.
* ''{{Laserblast}}'' as seen on ''MST3K''.
* ''Series/CaptainPowerAndTheSoldiersOfTheFuture''
** Soaron and Blastarr from have arm-mounted Digitizers attached to their forearms; they slide over their fist and lock into position when used to digitize a hapless human victim. Blastarr also has cannons on his fingertips.
** Additionally, Hawk from the Future Force has a miniature rocket launcher mounted on top of his arm. It fires tiny but devastating missiles.
* The Interceptor in ''{{Interceptor}}'' had his zapper mounted to his left sleeve.
* One of the perks of being a Protector in ''EarthFinalConflict'' is getting your very own ''organic'' arm cannon.
* The Tavleks mercenaries in ''Series/{{Farscape}}'' are armed with a gauntlet that can fire energy blasts, create force-fields, and inject the wielder with a powerful stimulant. Unfortunately, though the stimulant enhances strength and speed, it also has a [[WithGreatPowerComesGreatInsanity nasty habit of giving new users delusions of grandeur]]. The good news is that knocking the wearer out automatically detatches the gauntlet, thus making sure that they can be disarmed without being dis-armed.
* ''Series/MightyMorphinPowerRangers'': Rito Revolto had a flamethrower that mounted like a glove over his left hand. It was only used in his battles against the Ninja Megazord (the second of which was a recyc of part of the first).
[[/folder]]

[[folder:Tabletop Games]]
* ''DarkHeresy'' allows an upgrade for pistols called [[ExactlyWhatItSaysOnTheTin Forearm weapon mountings]].
* [=HITMarks=] from ''TabletopGame/MageTheAscension'', while more commonly shown using the gatling guns stored in their backs, do have machine guns in their arms as well.
* Both the first and second kind of Arm Cannon are available in ''{{Rifts}}''. The rulebook specifically points out the difficulties of the Type One Arm Cannon, but justifies it by pointing out that hands are tricky to get right, and Rifts is set in a (borderline) ScavengerWorld.
* ''TabletopGame/{{Shadowrun}}'' offers up this variety as well.
* In ''{{Warhammer 40000}}'', all terminators have the options of taking arm-mounted cannons of one kind or another.
* Some ''TabletopGame/BattleTech'' [[HumongousMecha BattleMechs]] do this as well, mounting one or more weapons atop or on the outer edge of the forearm. Early examples from the franchise include the ''Shadow Hawk'' and ''Thunderbolt'', which feature some of the largest gunbarrels relative to their size, while the contemporaneous ''Phoenix Hawk'' featured smaller weapons in double mounts on the forearms to complement its large laser rifle. Perhaps most impressive is the ''Thunder Hawk,'' featuring cannon barrels so grotesquely massive that they actually constitute a larger percentage of the left arm than the rest of the arm itself.
* The ''TabletopGame/TranshumanSpace'' setting features a realistic version in the form of "weapon pods"; forearm-mounted modules, usually with two different guns integrated into them. (In fact, these appear in the game because one or two discussions of possible future infantry equipment at the time of its publication actually included the idea.)
[[/folder]]

[[folder:Video Games]]
* Pictured atop this page is Samus Aran from the ''VideoGame/{{Metroid}}'' series. Her [[PoweredArmor Power Suit]] has one of these, which functions as a SwissArmyWeapon, being able to fire different kinds of beams (and Missiles) that are typically unlocked over the course of a game. It might look like an ArmCannon of the first kind, but the cannon is simply part of her power suit and not a replacement of her actual hand ([[http://img3.wikia.nocookie.net/__cb20130322014337/metroid/images/0/0d/X_ray.png which can be seen with the X-Ray visor]] in the ''[[VideoGame/MetroidPrime Prime Trilogy]]'').
* All of the [[PowerArmor MAX Suits]] in ''Videogame/PlanetSide 1'' utilize this. The Terran Republic has a gun fitted onto each arm behind the gloves, whereas the New Conglomerate and Vanu Sovereignty has a single big gun on the right arm instead of hands. ''Planetside 2'' has the New Conglomerate using this as well for their (now akimbo) cannons, while the Vanu Sovereignty MAX shifts to carrying a large cannon in each hand.
* The Majestic XII Commandos from ''VideoGame/DeusEx'' have some sort of devices built into the arms of their suits that packs the capabilities of pretty much all the normal weapons in the game (assault rifle, sniper rifle, flamethrower, rocket launcher). To fire, they level their arms at their target while clenching their fists.
** Not quite a gun, but JC's minicrossbow is attached to his arm.
** ''VideoGame/DeusExHumanRevolution'' has a boss character with a minigun arm. [[ShoutOut Coincidentally]], his name is [[VideoGame/FinalFantasyVII Barret]].
* The Alt Eisen and Weiss Ritter in ''VideoGame/SuperRobotWars'' both have guns mounted on their left arms.
** This comes from being based on the Gespenst, since every type of Gespenst has three barrels mounted on their right arm. Strangle only the Wei?Ritter and Alt Eisen actualy have build in weapons which use them as range attack and the Gespenst II M, makes use of the barrels as close range weapon. Which makes someone wonder why the other types have those barrels but no weapon build in to use them.
*** On the older Gespensts (''and'' the MK II M), those are apparently the hilts of their Beam Sabers. The MK II M's are designed to be able to do the Jet Magnum attack.
* Tytree in ''VideoGame/TalesOfRebirth'' fights with his [[PowerFist fists]] and a crossbow attached to one of his arms. For one of his [[CombinationAttack dual]] [[LimitBreak hi-ougis]], the crossbow turns into a {{BFG}}.
* In ''VideoGame/FrontMission'' (SNES) and its later [=PlayStation=] remake (and the Nintendo DS port of that) named ''Front Mission 1st'', at least one of the early game arm parts has an integral machine gun; it's strong, has good accuracy for the early game and can save you money due to not having to buy a separate machine gun for a regular arm. Its only downsides are the inability to unequip, the weight, and those of a machine gun (as a Short range weapon its priority is higher than Melee weapons but lower than Long range weapons, and between Short range weapons its priority is less than a Rifle which only shoots once per attack).
* Slipskulls in ''VideoGame/{{Resistance}}: Fall of Man'' have their guns mounted to their arms with metal bands. When you find a pair of their weapons lying around in the New Game + , you just use them like regular machine pistols, though.
* As of ''VideoGame/{{Touhou}} 12.3 Hisoutensoku'' Utsuho's [[ILoveNuclearPower control rod]] canonically functions as one of these.
* In ''VideoGame/WorldOfWarcraft'', Grandmaster Engineers can attach hand-mounted rocket launchers to their gloves.
* Colonel Daren from ''RedDeadRevolver'' has an arm cannon after certain events in the beginning of the game.
* Rinoa Heartilly from ''VideoGame/FinalFantasyVIII'' has a weapon called "Blaster Edge" on her arm, which can launch a variety of disc-like projectiles in a boomerang trajectory. In her LimitBreak "Angelo Cannon," she can shoot ''her dog'' like this. (No, not [[ShootTheDog that way]]. [[AbnormalAmmo This way]].)
* In ''VideoGame/AssassinsCreedII'', LeonardoDaVinci builds a pistol modification into Ezio's hidden blade gauntlet quite late into the game. Maybe you would expect that it allows for some stealth, until the sound it makes almost makes you think that they're making a fireworks missile explode right next to your ear. It does OneHitKill everyone, though, even the [[HeavilyArmoredMook Brutes]].
** As a fair warning to other tropers, [[spoiler:The POPE, and Cesare are both ImmuneToBullets. This is strange since the first is an old man in robes, and the other is a whiny 20 year old in light armor (stops "two-handed" claymore swords too...)]]
*** Which is something of a moment of fridge brilliance, come to think of it. One would suppose the Animus disregards the bullets because Ezio doesn't remember either of them dying that way. [[spoiler:He saw Rodrigo die by a poison apple, and dropped Cesare off a high wall.]]
* [[TheWormThatWalks Hunters/Lekgolo]] from the ''Franchise/{{Halo}}'' franchise have arm-mounted [[{{BFG}} Fuel-Rod Cannons]] or beam cannon projectors.
* Subject Delta from ''VideoGame/BioShock2'' has all his guns bolted to a plate on the back of his right hand.
* Firebats from StarCraft have twin, wrist-mounted flamethrowers. This continues on in the ''VideoGame/StarcraftII'' unit, the Marauder, who has twin grenade launchers for arms. It's a giant MiniMecha / PoweredArmor suit, though, so he can still take it off. The new Firebat has the same design as well.
* In ''VideoGame/PerfectDark'', [[FrickinLaserBeams the Laser]] and [[AnnoyingArrows the Crossbow]] are wrist-mounted.
* ''MDK2'': Kurt Hectic's helmet is his main weapon, working as a SniperRifle when on his face and a rapid fire chaingun when attached to his arm.
* Max from ''VideoGame/DoomTroopers'' has twin fireball-shooting bracers as secondary weapons.
* [[PoweredArmor Madogears]] from ''VideoGame/RagnarokOnline'' have these, including a cannon, a [[KillItWithFire flamethrower]], a FreezeRay, and a [[GatlingGood minigun]].
* The [[MagicFromTechnology Artificer]] in ''VideoGame/DungeonsAndDragonsOnline'' has a weapon called the Rune Arm which is essentially a {{Magitek}} Arm Cannon.
* [[GiantMook Shermans]] from ''VideoGame/{{Fracture}}'' have had one of their arms replaced by a bio-engineered grenade launcher.
* In the Daud DLC of ''Videogame/{{Dishonored}}'', Daud has a wrist-mounted crossbow as one of his ranged weapons. As well as functioning like the crossbow in the main game, it's capable of extending the bolt to pierce necks for stealth kills, similar to the Hidden Blade of Franchise/AssassinsCreed.
* ''VideoGame/WildStar'''s Warriors have a Power Sword and the "[=XL45=] Hell Mitten," an arm-mounted device that acts as a cannon, a shield, a chainsaw, and many other deadly and practical devices.
* In ''Videogame/PokemonXAndY'', Blastoise gains these with its Mega-Evolution.
[[/folder]]

[[folder:Web Comics]]
* ''TheCyantianChronicles'': Cere, a cybernetically altered anthropomorphic kangaroo, has one built into her arm. But it's not too reliable.
* Jordan Kennedy, the evil genius landlady from ''ExploitationNow'', has a cybernetic left arm with a built-in plasma cannon.
[[/folder]]

[[folder:Web Original]]
* Rob from the web fiction serial ''Literature/DimensionHeroes'' sports a Mega Man-esque blaster on his right hand when in Guardian form.
[[/folder]]

[[folder:Western Animation]]
* Megatron has a [[{{BFG}} very big, very intimidating gun]] attached to his right arm in ''Franchise/TransformersGeneration1'', ''WesternAnimation/TransformersAnimated'', and ''WesternAnimation/TransformersPrime''. The ''WesternAnimation/BeastWars'' version had his dino-head take the place of one arm, and serve as the cannon (as did the tail that became his arm when he went Transmetal.) Oddly, when in beast mode, he ''couldn't'' fire energy bolts from his mouth.
** This is good for Megatron in Prime, even if it's not yet been used as a story point; given that without a T-Cog most bots can't use their guns, he's got an advantage should he ever lose his.
** Hilariously spoofed [[http://www.youtube.com/watch?v=K1YCztmwPZs here]]
** So do lots of other ''Franchise/{{Transformers}}'' in varying sizes.
** ''Animated'' Swindle actually has a {{BFG}} that he attaches to his wrist like Megatron, and a pair of retractable cannons ''on each arm''. This is in addition to his over-the-shoulder lasers, and the [[GatlingGood gatling gun]] coming out of his [[ChestBlaster chest]].
* Every robot or cyborg character on ''WesternAnimation/{{Gargoyles}}'' has a retractable particle beam gun in its forearm, with an almost identical extend/retract mechanism. Sensible, since all of them were evolved from designs stolen from Cyberbiotics by Xanatos, and it's hard to reinvent the wheel when you didn't invent it in the first place.
* Buzz Lightyear, of ''WesternAnimation/ToyStory'' and ''BuzzLightyearOfStarCommand'' fame, has a laser built into the wrist of his suit -- at least on the latter where it's standard-issue; on the former it's "a little lightbulb that blinks".
** His team in the latter had them as well, except for XR, had neither this, nor the other version, but had a much larger arsenal, part and parcel with being a robot. The wrist-mounted laser seems to be part and parcel of the standard issue [[SpacePolice Star Command]] combat suit.
** [[TheDragon Warp Darkmatter]] is somewhere between this and and his arm being the cannon. Normally, he has a robotic claw hand at the end of his artificial right arm, though it has been switched out with a laser cannon and a flamethrower.
* Odd from ''WesternAnimation/CodeLyoko'', in his Lyoko Avatar, fires "Lazer Arrows" from his wrists.
* Wildwing in ''WesternAnimation/TheMightyDucks'' has an "[[IKnowMaddenKombat explosive puck]]" launcher (effectively a grenade launcher) mounted on his right gauntlet.
* Modo, of the ''BikerMiceFromMars'', has an energy blaster built into the forearm of his mechanical right arm. It extends and retracts in a manner similar to the ''Gargoyles'' examples above.
* Teela has a wrist-mounted laser in ''WesternAnimation/HeManAndTheMastersOfTheUniverse1983''. In [[WesternAnimation/HeManAndTheMastersOfTheUniverse2002 the 2002 reboot]], Man-At-Arms wears a big cannon on his forearm sometimes.
* Air Enforcer and Noxious from ''WesternAnimation/SkysurferStrikeForce''.
* The {{Mooks}} in ''DragonFlyz'' use these.
[[/folder]]

[[folder:Real Life]]
* [[http://www.3riversarchery.com/Gift+Ideas+Gifts+Under+$50.00++Wrist-Rocket+Pro+Slingshot+by+Saunders+Archery_c48_s215_p0_i9935_product.html This slingshot]] is mounted atop one's wrist.
* An experimental one shot weapon was developed during WW II [[http://www.timelapse.dk/thesleevegun.php to be fired from the arm]]. It made a brief appearance in ''Film/InglouriousBasterds''.
[[/folder]]

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