[[{{Transformers}} http://tvtropes.org/pmwiki/pub/images/Megatronanimated.jpg]]
[[caption-width:220:It's not CompensatingForSomething, [[OrIsIt really]].]]

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 [[ArtificialLimbs Artificial Limb]] would allow you to ''hold'' a gun, and do other mundane tasks with the limb when you're not in combat. A specialised version is a robotic hand that ''[[WhatDoYouMeanItsNotAwesome turns into a gun]]''.

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. Aiming it is usually a simple matter of pointing in the general direction of whatever it is you want to shoot.

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 BladeBelowTheShoulder. Not to be confused with HandCannon. Or, for that matter, ArmedWithCanon.

Please limit to {{Canon}} examples ([[IncrediblyLamePun ...really?]]) .

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[[foldercontrol]]

!!Examples of the First Kind (arm ''is'' cannon)

[[folder:Anime & Manga]]
* ''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 ''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.
* ''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.
* Bonnie from the first ''GunsmithCats'' manga arc was maimed after a run-in with Rally and May. Afterwards, she had a shotgun built into her prosthetic leg (along with a few other toys, including a garrote replacing the thumb Rally blew off) and went with her brother to seek revenge.
* Hyūgo Kujiranami in ''RurouniKenshin'' first uses an Armstrong Cannon for an arm, and then a grenade launcher 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 {{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. His other arm can morph into something akin to a WaveMotionGun.
* Not very common in ''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 ''Innocence'', Batou reveals that he has a cannon (well, a single-shot large-caliber firearm) built ''into'' his arm.
*** While not a cannon or even a gun, the existence of the crab claw military prostetic has led this troper to believe that other more extreme guns are available.
*** It's actually mentioned to be a shotgun of some type, and it has more than one shell available -- look at the fight at the end.
** 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 ''SpaceAdventureCobra'' has a cannon replacing his left arm, the "Psychogun", which fires beams powered by his psychic energy.
* Guts in ''{{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 ''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]].
* Miyu in ''{{Mai-HiME}}'' and ''{{Mai-Otome}}'' can turn her arm into an energy gun and a flamethrower, in addition to having ''knee'' cannons.
* After losing an arm (and an eye and a leg) in a NoOneCouldSurviveThat moment in ''GundamSEED,'' Andrew Waltfeld appears in the sequel series ''GundamSEEDDestiny'' sporting a prosthetic replacement which, in a pinch, turns out to have a gun built into the wrist, revealed by partly detaching the hand.
* Rize Greymon in ''DigimonSavers'' had a huge revolver arm transformed from his Rookie form's wrist straps.
* The protagonists of ''{{Ayakashi}}'' and ''{{Mushi-Uta}}'' 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.
* One episode of ''FullmetalAlchemist'' featured a character who had a single-shot weapon built into the knee of their automail leg. Not quite an ''arm'' cannon, but it should count for something.
** However, in the same episode, one character is seen cleaning (or polishing or something) an unused arm canon. And a much earlier epsisode 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.
** On top of that, both Edward and Wrath (anime version) have transmutated their arms to machine guns.
** 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 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 ''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 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]]]].
[[/folder]]

[[folder:Comics]]
* 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]], 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.
** 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 GreenLanterns) 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]].
* IronMan, whose suit is a weapons-platform anyway.
* The [=KGBeast=], a Russian ''ComicBook/{{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.
* ''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.)
* This was the schtick of Handgun, one of the minor ''AstroCity'' villains murdered in the "Tarnished Angel" arc. His widow is seen trying to sell his spare handgun units.
* Minor X-Men character Random was a shapeshifter who frequently turned his arms into cannons made of flesh. It was never made clear what they are supposedly shooting.
* 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.
[[/folder]]

[[folder:Films -- Animation]]
* EVE from ''{{WALL-E}}''. Like Mega Man, she can morph it from gun to hand, and even a little transistional 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.]]
* In Disney's ''{{Treasure Planet}}'', Long John Silver was a cyborg and had an arm that transformed into a cannon at one point.
[[/folder]]

[[folder:Films -- Live Action]]
* Cherry Darling of ''{{Grindhouse}}: Planet Terror'' gets a ''leg cannon''(!). (The original leg got eaten. [[ZombieApocalypse It happens.]])
* In ''{{Robocop}} 3'', the titular hero has gotten 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 ''{{Terminator}} 3'' can turn its arm into an energy gun and a flamethrower, among other weapons.
* ''{{Videodrome}}''
* In the 2007 ''Film/{{Transformers}}'' film, Ironhide whips out two huge, glowy cannons from his forearms (quoting Dirty Harry in the process), and Megatron turns his arms into a huge cannon!
** In fact, almost every projectile weapon used by the robots are like this, produced from their own arms and directly connected to their body. Optimus Prime is actually unique in these films in that his guns are formed to be used separate from his body, although compensated with [[DualWielding his twin swords]].
** Megatron in ''Revenge of the Fallen'' has had his cannon integrated into one arm this time, also including a vicious blade weapon.
* ''StarWars'': Two entire lines of CIS Battle Droids.
* The heroine of the Japanese film ''Kataude mashin gâru'' (a.k.a. ''{{The Machine Girl}}'') 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.
[[/folder]]

[[folder:Literature]]
* DavidWeber's 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 Timothy Zahn's [[http://en.wikipedia.org/wiki/COBRA_(science_fiction_novels) Cobra trilogy]]. 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.
**Not to mention the unbreakable bones, strength enhancement, brain-integrated microcomputer, and built-in-the-chest sonic weapons. That's an arsenal I wouldn't mind having!
*** Bet you could do without the arthritis-like effects of those mods as the person ages, though.
* In Clive Cussler's [[NUMASeries Oregon Files]], 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 [=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 ''StarWars'' [[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.
[[/folder]]

[[folder:Live Action TV]]
* Autons (of the shop window dummy variety in ''DoctorWho'') 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.
* Cylon Centurions from the re-imagined ''BattlestarGalactica'' 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.
* In ''BlakesSeven'', [[TheDragon Travis]] has an artificial left hand with a gun built into it.
* Riderman, from ''KamenRiderV3'', was notable for being a KamenRider 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 ''KamenRider SPIRITS'' 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.
* Adam, in season 4 of ''{{Buffy the Vampire Slayer}}'', has both a mini-gun and a grenade launcher built into his arm.
[[/folder]]

[[folder:Tabletop Games]]
* The Obliterator cult from ''{{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.
** Space Marine Terminators have Assault Cannons, gatling type guns that are attached to one hand. Their Chaos counterparts have a similar gun, the Reaper Autocannon.
** 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 [[BizarreAlienBiology they have backup arms]]...
* Meanwhile, over in ''{{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 ''{{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.
** Later ''Shadowrun'' rules deleted the essence cost for cyberguns implanted in cyberlimbs... Merry Christmas!!
*** If by later, you mean the ''2nd Edition'' that's since been superseded by 3rd, 4th and the 20th Anniversary edition, you're technically correct. However when the publisher found out that people were getting cyberguns implanted straight into their meat, they clarified that they had meant "Cyberguns installed into cyberarms cost no essence."
* Though there are no official "standard" magic items to do such, creating a component for a warforged (from ''[[DungeonsAndDragons Dungeons & Dragons]]''' {{Eberron}} campaign setting) that did something similar would be a matter of upgrading the damage an arm''bow'' could cause.
* Alchemical {{Exalted}} can get a special ability 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 The Elegant Nova of Progression]].
* 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.
[[/folder]]

[[folder:Video Games]]
* Barret in ''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 ''Advent Children'' he upgraded to a cybernetic arm that can [[MorphWeapon shift]] to a Gatling gun '''or''' a particle beam cannon.
** An interesting variation as in Advent Children it seems to need reloading once in a while.
* 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.
* ''MegaMan'' in many incarnations. [[strike:Some]] [[strike:Most]] 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 turrents and flamethrowers onto his arm, classic-style, in the fourth game.
** And on the subject of Zero, Fighting Fefnir. By extension, Model F users in ''ZX'', which actually falls into the second category.
*** Model FX users just have [[ReallyBigGun Really Big]] GunsAkimbo.
** In the ''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 beginning of the ''Zero'' series. The so-called Z-Buster is a pistol he grabbed off a dead redshirt to fight the Pantheons.
* Wild Dog in the ''TimeCrisis'' games. He replaces the arm he lost in the first game with a machine gun, and by ''Time Crisis 4'' he's modified it to include a rocket launcher, a flame thrower and a ''tractor beam''.
* ''{{Vectorman}}'' has guns in the palms of his hands, combining features from both types.
* In ''{{Persona 3}}'' Aigis gets the deluxe version: Many of her equippable weapons (including her starting one) feature an ArmCannon that allows her to fire bullets from her fingertips.
* Forcystus in ''{{Tales of Symphonia}}'' 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.
* Tytree in ''{{Tales of Rebirth}}'' 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 ''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 ''{{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.
* In the ''ArmoredCore'' series, arms with integrated weapons are possible part selections for your humongous mecha. This Troper has seen every type of weapon integrated into the arms -- arm machine guns, arm beam swords, arm beam cannons, arm ''bazookas''...
* The Pokémon 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]]''.
* KOS-MOS from the ''{{Xenosaga}}'' series.
* Hunters from 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 ''{{Wolfenstein 3D}}'' have arm cannons, such as the Grosse Family and [[StupidJetpackHitler Adolf Hitler]].
* At the end of ''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 ''{{Command and Conquer}}: Red Alert'' has his arm turned into a tank cannon. Depending on the level, he may use a silenced pistol instead.
* Reisen from the ''{{Touhou}}'' shooting game series is shown to fire her bullets straight out of her fingers (often with her hand in the classic [[WhenDidTheyGetLasers invisible gun]] pose).
[[/folder]]

[[folder:Web Comics]]
* Reona from the webcomic ''[[{{Zap}} Zap!]]'' lost her arm in the backstory, and had it replaced with a [[http://www.zapinspace.com/d/20070813.html retractable arm cannon]].
* 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.
[[/folder]]

[[folder:Web Original]]
* 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 ''{{Transformers}}''. G1 Megatron is easily the most memorable one.
** 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.
* When [[spoiler:Lightning Lad]] of the ''{{Legion of Super Heroes}}'' 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 ''{{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 Fox, from ''{{The Adventures of the Galaxy Rangers}}'' has a bionic arm. It needs a bit of charge time before firing making it an arm-sized WaveMotionGun more than an ArmCannon.
* Can't forget Deadshot from ''[=~Batman: Gotham Knights~=]''... complete with ''[[MoreDakka dakka]]''!
* In the ''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.
* In the AnimatedSeries of ''TheMask'', the titular character has a pirate form that has an appropriately-styled cannon replacing one arm.
* In ''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 ''StarWars''' Droidekas.
* The villain Hordak from ''[=~She-Ra: Princess of Power~=]'' could transform at will his arm into a cannon.
[[/folder]]

[[folder:Real Life]]
* This troper knows of 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.
* [[http://www.youtube.com/v/ShZBnqdb9AI&start=337 Jay J. Armes]].
** Who actually had his own [[http://www.journalofantiques.com/April07/playing_around.html action figure]] -- I know this because I had it as a kid (showing my age, here).
[[/folder]]

!!Examples of the Second Kind (arm-mounted cannon)

[[folder:Anime & Manga]]
* 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 ''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 [[GGundam Shining Gundam]] has a pair of light beam guns on its arms.
** And before either of those, the ZetaGundam had twin grenade launchers.
* 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 ''OnePiece'' combines his invisibility powers with a pair of arm mounted bazookas to surprise his enemies.
[[/folder]]

[[folder:Comics]]
* TheDCU villain Deadshot typically gets into gunfights with a pair of wrist-mounted guns.
[[/folder]]

[[folder:Films -- Live Action]]
* The {{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 shoulder-mounted plasma gun.
* Super Battle Droids from the ''StarWars'' prequel trilogy, of course. Their right wrists are equipped with blaster and small-caliber rocket launcher.
[[/folder]]

[[folder:Literature]]
* The Pyrrans in Harry Harrison'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 with large caliber pistols with live explosive rounds from about the time they're old enough to walk, making them exemplars not only of arm-cannons, but several other kinds of insanity as well.
[[/folder]]

[[folder:Live Action TV]]
* The Kull Warriors from ''{{Stargate SG-1}}'' have an energy weapon mounted on both arms, which is essentially a miniature, rapid-fire staff weapon.
* ''{{Laserblast}}'' as seen on ''{{MST3K}}''.
* Soaron and Blastarr from ''{{Captain Power and the Soldiers of the Future}}'' 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.
[[/folder]]

[[folder:Tabletop Games]]
* Both the first and second kind of ArmCannon 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.
* HITMarks from ''{{Mage the Ascension}}'', while more commonly shown using the gatling guns stored in their backs, do have machine guns in their arms as well.
* ''{{Shadowrun}}'' offers up this variety as well.
[[/folder]]

[[folder:Video Games]]
* Samus Aran in the ''{{Metroid}}'' series. It's a part of her Power Suit, though, so she can take it off whenever she feels like it. The ''Metroid Prime'' games give more detail about how it works thanks to the X-Ray Visor: you can see inside the cannon with it, showing the bones of Samus's hand, and she apparently just pulls a trigger. In the first ''Prime'', you even see her changing her hand gesture to switch weapons. (''Prime 2'' doesn't have the X-Ray visor, and ''Prime 3'' only has upgrades to weapons, rather than different weapons to switch between, with the exception of the missiles.)
* The Majestic XII Commandos from ''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.
* The Alt Eisen and Weiss Ritter in ''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. Strangly only the Weiß 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.
* In ''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 ''[=~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.
* Not cannon nor anything resembling firearm, but [[{{Touhou}} Marisa's mini-hakkero]] counts. It must be [[AllThereInTheManual held and aimed at the person or thing she doesn't like]] to shoot a [[KamehameHadoken laser beam]].
** Utsuho's [[DoesThisRemindYouOfAnything wielded]] [[DeusExNukina nuclear]] [[http://en.wikipedia.org/wiki/Control_rod control rod]], on the other hand, is ''not'' a weapon.
*** As of Touhou 12.3, [[http://img529.imageshack.us/img529/641/meiring0538.jpg it is now.]]
* Glitch in ''MetalArms: Glitch in the System'' actually has his weapon replace his right hand. Meanwhile, his left hand can also be used to throw grenades and hold a scope.
* In ''{{World of Warcraft}}'', Grandmaster Engineers can attach hand-mounted rocket launchers to their gloves.
* Colonel Daren from ''{{Red Dead Revolver}}'' has an arm cannon after certain events in the beginning of the game.
* Rinoa Heartilly from ''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]].)
* HOW is ''MegaMan'' NOT on here?!
[[/folder]]

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

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

[[folder:Western Animation]]
* Megatron in ''{{Transformers Generation 1}}'' has a [[{{BFG}} very big, very intimidating gun]] attached to his right arm, as does his counterpart in ''TransformersAnimated'' shown above. The 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.
** So do lots of other ''{{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 ''{{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 ''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.
* Odd from ''CodeLyoko'', in his Lyoko Avatar, fires "Lazer Arrows" from his wrists.
* Wildwing in ''TheMightyDucks'' has an "[[IKnowMaddenKombat explosive puck]]" launcher (effectively a grenade launcher) mounted on his right gauntlet.
[[/folder]]

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