Chaingun

The chaingun (also known as "gatling gun") is a rapid-firing, multi-barrelled automatic weapon. It uses the same ammunition as the pistol, and is fed from the player's shared stock of bullets.

Doom 64
In Doom 64, the Chaingun is depicted with longer perforated/vented barrels and a worn blue tone (rather than its Doom counterpart's polished steel appearance). The handle and trigger group is also more similar to those used on real-world minigun-style weapons. Additionally, it has a smaller blue muzzle flash. The pickup sprite has a somewhat rusty appearance as well. When fired at a consistant rate, the screen will jerk up and down rapidly (though this is only a visual effect that does not mess with the gun's fire or aim at all).

Trivia

 * The weapon's classic first-person sprites are based off of a toy minigun called the Tootsietoy Ol' Painless.
 * The weapon was originally an assault rifle or submachine gun-type weapon in the Doom alpha, but was redesigned into a slow-firing rotary-barrel Gatling gun to give it immediate visual differentiation from other weapons, as well as to give it its own distinct style.
 * The chaingun’s hud sprites in the Atari Jaguar port of Wolfenstein 3D are based on Doom’s.