The Chaingun is a multi-barrel rapid-fire weapon featured in Doom (1994), Doom (1995), and Final Doom (1996). It is highly effective at stunlocking individual enemies due to its high rate of fire. The weapon shares its ammunition pool with the player's starting pistol.
Designed by id Software, this weapon's visual aesthetic was inspired by real-world rotary cannons, adapted into a portable format for the protagonist. In
Doom (1994), players typically acquire it in early military-themed levels or secret areas. The weapon's utility expanded in
Doom (1995) and
Final Doom (1996) with the introduction of the Heavy Weapon Dude, an enemy type that wields the weapon and drops it upon death, providing a reliable source of both the firearm and ammunition.
Tactically, players exploit a specific programming quirk where the first two rounds fired from a stationary position possess perfect accuracy. This technique, known as tapping, allows the weapon to function as a makeshift sniper rifle against distant targets. The weapon's distinctive firing sound effect, sourced from commercial sound libraries, became one of the franchise's most recognizable audio cues. Its success established the multi-barrel machine gun as a standard archetype in first-person shooters, directly influencing weapon design in subsequent id Software franchises and the modern reboots of the series.