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The chaingun 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.

The chaingun is first found in a secret area of E1M2: Nuclear Plant, and again in a secret area of the following level. It then appears in a non-secret area on E1M4: Command Control. In Doom II, it is first found on MAP03: The Gantlet from either of the hands of a heavy weapon dude or on the ground.

The chaingun contains 20 rounds of ammunition when picked up (40 on the "I'm Too Young To Die" and "Nightmare!" skill levels). Chainguns taken from fallen heavy weapon dudes contain 10 rounds (20 on ITYTD and NM) and, unlike pre-existing chainguns, disappear when crushed beneath doors or moving ceilings.

"Chainguns direct heavy firepower into your opponent, making him do the chaingun cha-cha." Combat characteristics[edit]

The chaingun always fires in pairs of hitscan shots, as long as the player has two bullets or more. Each bullet inflicts 5-15 points of damage. The first two shots in a volley will always be exactly on target, but if the trigger is held down, later shots will suffer from the same dispersal as pistol shots (standard deviation around 2°, to a maximum of ±5.5°).

Tactical analysis[edit]

The chaingun's rapid rate of fire means that a single enemy caught in its hail of bullets will have little or no chance to retaliate such as demons and cacodemons (except boss monsters, whose pain chance tends to be very low). The weapon is also highly effective at mowing down hordes of zombies or imps. Because its recoil does not affect the first two shots, it is an ideal weapon for sniping, as the player can tap the fire button for accurate two-shot bursts.

Notes[edit]

As with the rocket launcher and BFG9000, the first-person chaingun sprite is slightly too large for the screen, and can only be viewed with a level or resource editor.
The images for the chaingun in Doom are those from the "Ol' Painless" Tootsie Toy Gatling Gun, a motorized, electronic toy Gatling cap gun.
The target of chaingun fire often appears to turn and shuffle rapidly in place, due to the continual interruption of its sprite sequences. Doom's instruction manual refers to this motion as "the chaingun cha-cha."
In Doom 64, the chaingun is depicted with longer perforated barrels, and a worn blue tone, rather than its counterpart's polished steel appearance. Additionally, it has a smaller blue muzzle flash. The pickup sprite has a somewhat rusty appearance as well. When fired at a consistent rate, the screen will jerk up and down rapidly.
The firing animation for the chaingun is different in PSX Doom. In the PC version, the muzzle flash is continuous, whereas it blinks in the PSX port.
The chaingun first appeared in the Doom press release beta. Its graphic was slightly different, in that the tips of the barrels did not extend past the barrel band.
Wolfenstein 3D, the game id Software released immediately before Doom, included a similar chaingun.
If the chaingun is associated with real weaponry, it is actually a portable Gatling-style weapon similar to a minigun. An actual chain gun has a single barrel whose bolt is cycled by an electrically-driven chain.
The chaingun also feeds from magazines, which is rather unusual for a Gatling gun, as Gatling guns - including the chainguns carried by heavy weapon dudes - are generally belt-fed.
As with all firearm hitscan attacks, the damage inflicted per bullet by the player's weapon is slightly higher than that of monsters using equivalent attacks.
In the Sega Saturn port, the chaingun fires much faster than in other ports.

Data[edit]

The chaingun in the press release beta.

Weapon attributes Weapon slot 4 Included ammo 20 (40 on skills 1 & 5) Max ammo 200 (400 with backpack) Ammo type Bullets Shots per minute 525.0 Carousel icon SMMGUN State Sprite Frames Before pickup MGUN 1 [A] Wielded CHGG 1 [A] Firing CHGG 3 [ABB] Refiring CHGG 2 [AB] Flashing CHGF 2 [AB] Ranged attack Type Hitscan Damage 5-15 per bullet Sprite PUFF (impact, miss)
BLUD (impact, hit) Frames 4 [ABCD] (impact, miss)
3 [CBA] (impact, hit) if damage > 13
2 [BA] (impact, hit) if damage <= 12
1 [A] (impact, hit) if damage <= 8 Sound DSPISTOL (firing)

Data not listed is the same
as for the original version.

Weapon attributes Shots per minute 600.0 State Sprite Frames Flashing CHGG 1 [CD] Ranged attack Damage 4-16 per bullet Sprite PUFF (impact, miss)
BLUD (impact, hit) times 3 Frames 6 [ABCDEF] (impact, miss)
4 [ABCD] (impact, hit) if damage > 13
3 [BCD] (impact, hit) if damage <= 12
2 [CD] (impact, hit) if damage <= 8 Sound SFX_033 (firing) Damage done by one chaingun tap

This table assumes that all calls to P_Random for damage, pain chance, blood splats, and bullet dispersal are consecutive. In real play, this is never the case: counterattacks and AI pathfinding must be handled, and of course the map may contain additional moving monsters and other randomized phenomena (such as flickering lights). Any resulting errors are probably toward the single-bullet average, as they introduce noise into the correlation between the indices of "consecutive" calls.
In the case of continuous fire, the target must be close enough to compensate for the weapon's recoil.
Assumes that direct hits are possible, which does not occur in any stock map.

Demo files[edit]

Chaingun "tapping" technique (file info) being demonstrated on MAP07: Dead Simple.

Appearance statistics[edit]

In the IWADs the chaingun is first encountered on these maps per skill level:

Multiplayer Game / Episode 1-2 3 4-5 Knee-Deep in the Dead E1M1: Hangar E1M1: Hangar E1M1: Hangar The Shores of Hell E2M2: Containment Area E2M2: Containment Area E2M2: Containment Area Inferno E3M2: Slough of Despair E3M2: Slough of Despair E3M2: Slough of Despair Thy Flesh Consumed E4M1: Hell Beneath E4M1: Hell Beneath E4M1: Hell Beneath Doom II MAP01: Entryway MAP01: Entryway MAP01: Entryway TNT: Evilution MAP01: System Control MAP01: System Control MAP01: System Control Plutonia Experiment MAP04: Caged MAP04: Caged MAP04: Caged

The IWADs contain the following numbers of chainguns per skill level (excluding those from fallen heavy weapon dudes):

Multiplayer Game / Episode 1-2 3 4-5 Knee-Deep in the Dead 9 9 9 The Shores of Hell 7 7 7 Inferno 6 6 6 Doom (registered) 22 22 22 Thy Flesh Consumed 11 11 11 Ultimate Doom 33 33 33 Doom II 37 37 37 TNT: Evilution 44 45 43 Plutonia Experiment 20 20 20 See also[edit]

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