Changes

The Doom 3 chaingun differs from its original; there is a slight wind-up time (around 1 second) for the barrel array before it begins firing. Also, unlike the classic chaingun, which fired the same standard rounds as the pistol, the Doom 3 chaingun now utilizes exclusive .30 {{wp|caliber}} armor penetrating rounds, easily outclassing the pistol and machine gun in terms of firepower. Ammo for the chaingun is in the form of ammo belts (60 rounds) which appear as ammo cans about the size of a briefcase, and can also be obtained by picking up chainguns (30 rounds) from deceased chaingun commandos. Just like [[BFG 9000 (Doom 3)|BFG 9000]], [[Plasma gun (Doom 3)|plasma gun]] and newcomer [[machine gun]], the ammo counter is located on the weapon itself, instead of the game HUD. Like the machine gun, the chaingun has a built in "buzzer" alarm which activates when players are reduced to 10 bullets in their current clip, suggesting the player to reload.