The GAU-8 Avenger is a 30 mm hydraulically driven seven-barrel Gatling-type cannon. This huge gun takes an army to reload — in this case, the Air Force. The gun was designed specifically for the anti-tank role because of the high rate of fire — It’s so big, the magazine can’t be simply popped in. The magazine has to be trucked in and requires multiple workers to complete the process. What do you expect, when the gun can fire off 3,900 rounds per minute?! Check out the entire process of reloading this behemoth and even get a look at the damage it can cause.