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"This is the kind of gun they used to put planes on. It wasn't a case of 'Oh, we got this jet fighter, it kinda needs something besides missiles and bombs and shit, let's strap this thing on'. NO. It was a case of a guy making a gun SO awesome, that he just stepped back, and said, "This shit needs to fly'. And everyone else is like, 'You cant make a gun fly!'. And the first guy is all like, 'Fuck you, yes I can. I will strap a plane to this gun.' And everyone's like, 'You mean strap the gun to a plane?' And the first guy is like, 'No, man. I am strapping the plane to the gun. The plane is an accessory.' And then everyone's minds were blown. Like, there was some serious mind blowing going on there. Ears were bleeding. Synapses just went an committed suicide because it was so awesome."
—Smith, BOrangeFury's Fallout Let's Play, Pretty much describing the GAU-8 Avenger

Ever since Richard Gatling's 1861 invention, the rapid-firing rotary gun has had a special place among BFGs. Because it's basically the gun equivalent of a chainsaw, there is an undeniable attraction to a gun which can produce high enough rates of fire to cleanly trim hedges, cut down trees, or, in the case of the GAU-8 Avenger, cut tanks in half. Just imagine what they do to human flesh.

As a rule, rotary guns are extremely heavy due to their multiple barrel units, require either external power sources or a complex gas-operation mechanism, and need huge ammunition supplies. Although capable of sustained fire, in real life they are generally only fired in short bursts, as firing exhausts their ammunition extremely quickly.

Despite numerous inaccurate descriptions, "chain guns" are not rotary guns: they are simply guns with a specific type of firing mechanism, and in real life only have one barrel. Also of note is that early revolvers, repeater guns and even light cannon ("organ guns") often had multiple barrels, sometimes rotating. This is something else again: each barrel is loaded individually and fired separately, and these are less rotary guns than an old and highly inefficient form of revolver.

Gatling guns have enduring popularity as rapid-fire guns in fiction, particularly film and games. Rates of fire so high they can only be described as "bullet spam" are quite useful in Real Life, as well. It should be noted that the reasons for this type of barrel system is more to KEEP the barrels cool, than to make them LOOK cool, thus why they can fire such ridiculous amounts of ammo without exploding.

It should be noted, however, that most videogames heavily downplay the rate of fire. This used to be for technical reasons - back when computers weren't terribly fast, calculating trajectory, damage and effects for fifty or so bullets per second would slow the framerate down to a crawl - and good luck sending all that information through a 56k link during a multiplayer game. Nowadays the technical reason is no longer important, as computers and broadband links are powerful enough to effortlessly process the needed information, but the rate of fire is usually kept down anyway for gameplay reasons: if you had a gun that could shred in half any enemy with just a half-second of sustained fire you'd have very little reason to use anything else, and balance would go to hell. There are a very few exceptions, but in general whenever you pick up a rotary gun expect to ask yourself "so, why exactly does this thing have more than one barrel?" every time you squeeze the trigger.

TV and cinematic portrayals of these weapons often have a similar problem, for a different reason. They show you a multi-barreled cannon spewing thousands of bullets per minute, but the sound effect is the "rat-a-tat-a-tat" of a normal machine gun, firing only hundreds of rounds per minute, because it is assumed that Viewers Are Morons who cannot grasp that a funny-sounding gun might actually still be a gun.

Modern superfast Gatling guns actually make a strange, deafening buzzing sound in the bass register (5000 rounds per minute equals 83.3Hz). Some of them, like the Phalanx anti-missile cannon, sound even weirder, because they start at a lower rate of fire and then spin up to a higher one in distinct steps, giving two or more separate "notes".

It should be noted that Gatling proliferation in reality isn't really dependent on Rule Of Cool so much as functionality. For example linear-action and revolver-style autocannons tend to have annoying issues with barrel wear at the high rates of fire required for things like shooting down missiles. In Real Life, Gatling guns are really useful when either the firer, the target, or both are moving at several hundred miles per hour relative to each other. The more rounds you can pump towards the target in the short amount of time you have to aim the better. For stationary/slow moving targets and firers, it's just a waste of ammo. A very fun, very impressive looking waste of ammo.

A popular form of the BFG in fiction, and both a fictional and real-world way of achieving More Dakka via Everything's Better With Spinning. See also Bang Bang BANG.


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