In the game's manual, it is described as such: While the pistol, machine gun, and chaingun all fire bullets, they do not use the same caliber and thus do not share the same ammo pool, as in earlier Doom games. If this is skipped, it can be found in Mars City off of one of the Z-Secs. It is first found in Mars City Underground after unlocking the second storage locker from T. In Doom 3: Resurrection of Evil, it is now the main starting weapon in multiplayer while the pistol acts as the sidearm. Take note that the ammo counter is on the weapon itself and not on the game HUD - similar to BFG 9000, chaingun and plasma gun. It can also be used for long-range work against enemies who are hiding behind cover.

It should be used to mow down hordes of lesser demons or zombies. It has very fast rate of fire, but less power in one bullet than the pistol. The machine gun uses ammo from machine gun magazines. It is useful against most demons up to the cacodemon and especially useful against the lost soul. It has a big magazine size, high rate of fire, and great accuracy. The machine gun, also known as the MG-88 Enforcer, is a versatile weapon introduced in Doom 3. This article is about the weapon in Doom 3. For other versions of this weapon, see: