Kim Possible: How often have you used that line?
Various parts of the body have been weaponized in fiction and the fingers are no exception despite their small size. Aside from Rule of Cool, the two most common reasons given for this setup are increased firepower and concealment.
This layout is more often used in 'raw power' machines to indicate their destructive ability. The implication is that the unit has many times the firepower of a grunt's main weapon- by having eight or ten of that weapon in its hands alone.
The primary claimed benefit of this design is that it offers More Dakka without sacrificing finger articulation. This ignores the fact that flexible or folding barrels would severely reduce the durability of the guns. Proposed workarounds include housing the entire weapon system in the fingertips, reducing the power of the weapons, making all the fingers rigid rather than articulated or having articulated fingers that go rigid before firing- all of which sacrifice either hand or weapon functionality. In the end, Rule of Cool is the only proper justification.
Pay special attention to the fingers of a Humongous Mecha if they appear to be flexible hollow tubes or if they sport openings or lenses at the ends because these indicate guns. 'Mittens' with rows of barrels are sometimes used by designers who want to mix things up, though these are even less practical as they lose all but the most basic hand functions. Some less humanoid designs may have hand-mounted guns that double as fingers rather than fingers with guns inside, usually in cases where the machine has fewer than five fingers on each hand.
Apart from the design difficulties listed in the firepower section, concealed finger guns also need an even greater degree of miniaturization or integration with the rest of the hand to keep them from being detected, placing further limits on their functionality. Cruder designs that impede the function of the fingers to allow greater power also make detection easier. Finally, risk of detection by internal scans complicates the inclusion of any built-in magazine as most ammunition has a distinctive appearance, limiting the guns to a small number of shots per weapon if solid rounds are needed.
Due to all these limitations, concealed finger guns are usually used for assassination or self defense. However, Humongous Mecha may make effective use of this design by concealing anti-personnel weapons in their fingers- these may not be effective on other large machines but are enough for infantry and light vehicles or aircraft.
NOTE: Guns installed in the metacarpal region (i.e. behind the base of the finger or even further back) should go under Arm Cannon, Power Palms or Hand Blast instead. For the gesture involving making a gun with one's fingers, see Finger Gun. The use of said gesture to channel magic or psionics belongs there as well. Stuffing the finger in a gun is Finger in a Barrel.
- 004 from Cyborg 009 has finger machine guns as part of his arsenal.
- Giant Robo has missile launchers in its fingers.
- GunBuster fires its Buster Missiles from its fingertips.
- Several machines from the sequel Diebuster have finger guns as well.
- The Moskas in Katekyō Hitman Reborn! fire out of their fingers and Mini Moska fires popcorn out of his fingers.
- Mazinger Z:
- In episode 10, Mazinger-Z shows he can shoot missiles from its fingers. That weapon is never used again, though (surely because the animators realized how silly and dangerous was storing missiles into a Rocket Punch).
- Several Mechanical Beasts are armed with this weapon (for example, Danchel in one of the earlier episodes. Or one Beast from the Mazinger-Z vs Devilman feature).
- Since the Zeong from Mobile Suit Gundam, Gundam series have occasionally put beam guns in the fingers of enemies they want to make especially threatening. The earlier Gouf from the same series had machine gun fingers.
- One of Blackbeard's henchmen in One Piece has these.
- Robot Romance Trilogy:
- Among many other armaments, the cyborg Grey the Ninelives had machine guns in each of his fingers in the anime of Trigun. For contrast, the protagonist Vash has an Arm Cannon.
- Wing Saber from Transformers Cybertron Transforms into some sort of Attack Plane, with his hands transforming from the miniguns mounted on it's wings, he's perfectly capable of using them as miniguns in his robot mode as well.
- This is Franklin's signature ability in Hunter × Hunter. Justified in that the fingers themselves are fully biological and functional, but what he's shooting are Ki Attacks. They still fall under this trope, however, as his stance and hand gestures when he shoots, and the damage and destruction they inflict, are as if he's wielding ten miniature machine guns.
- Naruto: Kimimaro, with his power to remove and regenerate his bones, is capable of shooting his fingertips at enemies like bullets.
- Black★Rock Shooter: Strength's Ogre Arms are a pair of mechanical fists bigger than she is, and have what appear to be gatling guns in each finger and thumb.
- A somewhat obscure Marvel Comics villain named Professor Power fought many heroes using Power Armor. One version of the armor included guns located in each fingertip of his gauntlets which he used in a fight against Spider-Man and the original members of the X-Men.
- The Marvel Comics hero Machine Man is capable of firing .357 Magnum rounds from one of his fingers.
- British comics hero The Steel Claw had a mechanical right hand, the main benefit of which was that he could become invisible by passing a large electrical current through it (no, me neither). However, it also concealed numerous handy gadgets, including a finger-mounted gun which fired armour-piercing ammunition.
- A one-off villain in an X-Men title was a mutant tattoo artist that could give power granting tattoos, who had variously empowered an entire gang. One of them had a gun tattoo on his hand and index fingers he could fire with the appropriate gesture.
- Some models of Sentinel robots in X-Men featured energy weapons in each of their fingers instead of a single energy weapon in each palm the way most models do.
- Power Rangers / Super Sentai
- Mighty Morphin' Power Rangers has the Dragonzord launch missiles from its fingertips. Tor did the same thing in season 2.
- The Delta Command Megazord of Power Rangers S.P.D. does the same with lasers. Its Sentai counterpart Dekabase Robo also uses finger-mounted missile launchers.
- In Power Rangers Jungle Fury, the Rhino Ranger's arm-mounted weapon had laser barrels on one side, looking similar to fingers when that side was used.
- The Ultimate Legendary Megazord got this on one hand, while the other became a giant, spiral grooved spear.
- The 1974 incarnation of Mechagodzilla can fire missiles from his fingertips.
- In The Aquabats! Super Show!, Jimmy the Robot has lasers built into his fingers.
- Doctor Who:
- The episode "The Android Invasion" features creepy, radiation suit-clad androids with guns built into their fingertips.
"...Is that finger loaded?"
- Similarly, the living-plastic Autons have guns concealed inside half of their hands — the fingered half drops away on a hinge, revealing the hidden ray-gun.
- The episode "The Android Invasion" features creepy, radiation suit-clad androids with guns built into their fingertips.
- Captain Power and the Soldiers of the Future: Blastarr, a Super Prototype of robot soldier, has laser guns in each of his fingers, and greatly enjoy blasting things with them, including sometimes gratuitously firing at the scenery. There is a scene where, after testing his weapons this way, he checks out each of his fingers, unscrews one which is malfunctioning and takes a look through the barrel.
- Shadowrun. Guns in cybernetic fingers were first mentioned in the 2nd Edition Cybertechnology supplement.
- In Warhammer 40,000 Obliterators are infected with a "virus" that turns their whole body into Shapeshifter Weapon. They sometimes manifest this trope (especially older models).
- Some of the more obscure factions (you can find them in the Inquisition codex, for example) of 40K have the Jokaero relics known as digital weapons: miniaturized versions of lasguns, flamers and needleguns that could fitted onto fingers like rings. They also popped up as equipment cards in the Spin-Off boardgame Space Crusade and are an available weapon on the Fantasy Flight Games roleplaying games starting with Rogue Trader.
- In Xenogears, Maria's Seibzehn has missile launchers in its fingers.
- The WA-FINGER weapon and its variants in the Armored Core series are multi-barreled machine guns designed to look like hands, probably just to justify the name.
- Earthworm Jim gets to use a multidirectional gun that fires out of the three fingers on his suit's hand. It burns through ammo very quickly, but damn if Jim doesn't look like he's having a blast while firing it.
- Aigis from Persona 3 has machine gun fingers fed by an external drum magazine.
- In Super Mario RPG, one of Geno's weapons is the Finger Shot, which fires bullets out of each of his fingers.
- In the same game, one of Smithy's true form's attacks involve using these.
- The SRX from Shin Super Robot Wars and any Super Robot Wars series that feature the SRX Team, due to its fingers being formed from the shoulder cannons of one of its components.
- Mega Man X:
- MACE, the Humongous Mecha Final Boss of Intrusion 2 has these. It can fire both fireballs and homing missiles from them.
- This is The Reaper's method of killing in Assassination Classroom. His index finger bone is replaced with a low-caliber gun, which is used to shoot his victim's aorta, causing the victim's blood to spill out.
- The assassin Mr. Igoe in Innerspace has a mechanical hand, which in one scene actually fires a bullet from the tip of its index finger - thereby forever one-upping the small child who had pointed his own finger gun at him. (Kid was fine. His balloon wasn't.)
- Yatsu possesses one in Tetsuo 2: Body Hammer, having been turned into a Living Weapon along with Tomoo by his father.
- Foaly armed Commander Root with the concealed variety in Artemis Fowl because he couldn't go into a hostage negotiation obviously armed. Foaly mentions that they aren't used often because the concealment is so good that people forget that they're wearing them, resulting in friendly fire incidents. Root 'accidentally' has one that knocks out an annoying coworker later in the book.
- Honor Harrington has a gun built into her finger and, from the description, her hand does move into something approximating the traditional finger gun position when she fires it. Of course, her entire arm is Artificial, and given that assassins keep trying to kill her throughout the books, this seemed like a prudent idea. Her prosthetic eye is specially equipped with targeting software to allow her to shoot from the hip as well - although her keen kinesthetic sense may make such aid superfluous. As you may have guessed from the list of prosthetic limbs Honor has, more than a few people have attempted to kill her over the years.
- E.E. Smith's Family D'Alembert series has family patrician Etienne and his weapon hand. Ostensibly lost in a circus accident (the cover story), it was replaced with something infinitely more useful. The various digits can be retrofitted with mission-specific tools (on one occasion he unscrews his pinkie for use as a grenade), but the index finger is a permanent fixture that contains a small blaster.
- In the Phoenix Force novels, Yakov Katzenelenbogen has a .22 Magnum zip gun hidden in his artificial hand.
- From Get Smart: "Would you believe this finger is a real gun?" They do find it hard to believe, so Max fires the gun in the air to prove otherwise. Unfortunately it's single shot. Max later reveals that it has a second shot ... and promptly fires it into the air. On one show Max is kidnapped and subjected to a Manchurian Agent treatment — they have to let him "escape" to avoid suspicion, but he repeatedly misses opportunities handed to him. At one point an agent approaches him, he raises a finger and the agent "surrenders", wise to the old "finger gun" trick. Max insistently points out it's only a finger until the agent walks out in frustration. Max keeps plotting an escape, muttering "Come on, Smart, use that fantastic brain of yours!"
- At one point in Season 3 of Agents Of Shield, Phil Coulson claims that he has one built into his artificial hand. But since he never uses it, he may have been bluffing. It has been confirmed that he has an artificial hand with a sensor system built in and another that can create a Hard Light shield.
- In Luke Cage (2016), Diamondback introduces himself to Cornell Stokes's former crew, who have been dispatched by Shades to look for Luke Cage's body. Diamondback draws out his right hand from his jacket and points it around in the Finger Gun gesture. Then he uses said finger to "fire" a round right into one henchman's shoulder. It turns out he'd drawn a real gun with his left hand and fired it from the hip while everyone was distracted, and it's his not-so-subtle way of telling them not to look for Luke Cage in the most obvious places.
- The cover of several Stereolab releases (the EPs Super 45, Super Electric, and Stunning Debut Album; the album Peng!; and the compilations Switched On and Refried Ectoplasm [Switched On Volume 2]) feature a grinning cartoon man in a collared shirt, with his forefinger replaced by a gun barrel. In all of these he's pointing straight at the audience, and in Peng! he's firing.
- In Warframe, gunslinger-themed frame Mesa's ultimate ability is to bring out the Peacemakers, pistols normally holstered on her arm by attaching them to her fingers, letting her blast away at any nearby enemies in her sight.
- There are novelty guns molded to look like fingers, which if held properly look as if the wielder is pointing with his or her own index finger. Technology does exist to integrate firearms into the fingers of prosthetic hands but the possibility does not seem to have been explored as the hands themselves are still being perfected.