I will actually talk about Classic Doomguy's Weapons now: Pistol The Pistol is based on the Beretta 92, it fires 9x19 mm parabellum bullets at 381 m/s, giving it a muzzle energy of 540.725 joules\ Shotgun The Shotgun was based on the TootsietToy Dakota Popgun Which looks similar to the Winchester 97 "Trench Gun" This specific shotgun he uses has 7 pellets in its shell, shotguns of this kind tend to go around 1300 fps. For the pellet size well: Given they're made of lead that's 3.5037386 grams per pellet, or 275.054 joules per pellet. Times 7 and that's 1925.378 joules assuming a 1300 fps muzzle velocity. However shotguns don't go by penetrative power, they go by its momentum that's 1.3883 kilograms * meters/per second for a single pellet, and 9.7181 kg.m/s for a direct blast of all pellets Chaingun The Chaingun came from the TootsieToys "Ol' Painless" Gun Toy, which is based on the Minigun used in Predator. So it's a minigun. The M134 Minigun fires 7.62×51mm...