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CALLSIGN: ZERO

Mod for Doom II: Hell on Earth (1994) | Category: Weapons

Author: Subject42 | Curator: User AvatarModbadger

Mod for Doom II: Hell on Earth (1994) | Category: Weapons

Author: Subject42 | Curator: User AvatarModbadger

CALLSIGN: ZERO is a tactical weapons mod for Doom based on the HELLRIDER mod. It replaces Doom's classic arsenal with modern, realistic weapons in a sleek monochrome finish, featuring incredibly smooth and crisp animations in the spirit of the Call of Duty series.

Uploaded01.07.2026 18:23
VersionLatest
Size190.00 MB
Views12
Downloads4

Localizations:

English

The mod is localized into 1 language

(You don’t need to download anything extra to play in these languages)

The centerpiece of CALLSIGN: ZERO is its exceptionally smooth, crisp, and detailed weapon handling animation, inspired by the reloads and movements from modern Call of Duty titles. All weaponry is rendered in a distinctive, austere monochrome finish that emphasizes the aesthetic of real tactical gear.

The gameplay is a perfect fit for players who miss the aesthetic of Ready or Not but don't want to sacrifice Doom's signature relentless pace. Immersion is further heightened by a built-in hitmarker system using punchy hit sounds drawn from iconic shooters: CoD 4, Black Ops Cold War, Titanfall 2, Overwatch, and Doom 2016.

The mod completely overhauls the standard arsenal, adding advanced mechanics such as iron sights, tactical reloading, on-screen ammo type indicators, and a mechanic for prematurely detonating a grenade by shooting it after it has been fired.

Weapons in CALLSIGN: ZERO are divided into the following categories:

  • Melee: The game features a detailed quick melee system using a rifle butt or knife. Melee turned out so effective that it can sometimes fully replace firearms.

  • Pistols and SMGs: The arsenal includes modern pistols (including custom tactical variants, among them chambered for the powerful .44 Magnum) and rapid-fire submachine guns for clearing rooms at extreme close range.

  • Shotguns: A full-featured pump-action Mossberg with high single-shot damage. The mod has a unique twist: when firing from the hip the pump cycle is slow, but in tactical aim-down-sights mode the character racks the slide noticeably faster. Semi-automatic combat shotguns are also available.

  • Assault rifles: A selection of modern automatic rifles and carbines. They support accurate fire through iron sights in single-shot or burst mode, as well as firing special ammunition types such as flechettes.

  • Heavy weapons: Includes devastating heavy guns, among which a detailed grenade launcher stands out, featuring an honest, round-by-round grenade loading animation.

The mod shatters the old critical assumption that the modern military style — first introduced in the Call Of Doom Tarkov mod — doesn't fit retro shooters, proving that realistic firearms pair perfectly with Doom's trademark fast-paced gameplay and make it even more gripping.

How to install a mod CALLSIGN: ZERO

To run the mod, you will need the GZDoom engine and doom.wad, doom2.wad, or one of the FreeDoom IWADs

  1. Make sure that doom.wad / doom2.wad or freedoom1.wad / freedoom2.wad is located in the GZDoom folder

  2. Move the mod's .pk3 file to the GZDoom folder

  3. Drag and drop the .pk3 file onto gzdoom.exe

  4. Play!

You can also create a Launcher.bat. This is useful for launching more complex mod builds where the loading order of mods is important, or to launch the game via a shortcut.

How to create a launcher for running mods based on GZDoom

Create a text file in the GZDoom folder, you can name it Launcher. The text can look like this, depending on which files you're using:

gzdoom.exe -iwad freedoom2.wad -file "brutalv22test4.pk3"

-iwad must always be first, and the number of files after -file can be unlimited, just write them in quotes separated by spaces, like this:

gzdoom.exe -iwad doom2.wad -file "addon1.pk3" "addon2.pk3" "addon3.pk3" "addon4.pk3"

Change its format from .txt to .bat by simply renaming it. Now you can launch your builds with a double-click on this launcher.