Call of Duty: Black Ops 4

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The following weapons appear in the video game Call of Duty: Black Ops 4:

Handguns

"Annihilator"

The "Annihilator" returns from Black Ops III as Seraph's specialist weapon. This time around, it appears to be based on a Smith & Wesson Model 500, and somehow has its hammer self-cock after firing despite the lack of a slide (similarly to the "Bloodhound" revolver from the earlier game), as opposed to being used in single-action mode like its previous counterpart.

Smith & Wesson Model 500 with HIVIS sights - .500 S&W Magnum

Seraph twirling her revolver.

First-person view of the "Annihilator".

Webley Mk VI

The Webley Mk VI is confirmed to appear in Zombies mode.

Webley Mk VI - .455 Webley

The Webley Mk VI in first person.

Scarlett Rhodes dual-wielding Webley revolvers.

Ejecting the casings; not only they still have have bullets in them, but also the cylinder has an incorrect capacity of eight rounds instead of six.

Shotguns

"SG12"

The "SG12" is a futuristic AA-12, shown operating in semi-automatic mode.

AA-12 CQB - 12 gauge

The "SG12" in first person.

Winchester Model 1897 Trench Gun

The Winchester Model 1897 is available in Zombies mode.

Winchester Model 1897 Trench Gun - 12 gauge

Stanton Shaw using his Trench Gun.

A nice closeup of a shell being chambered.

Submachine Guns

MP40

The MP40 is available in Blackout mode.

MP40 - 9x19mm

Rifles/Carbines

IMI Galil ARM

The IMI Galil ARM returns from previous Black Ops games as the "Grav", and is available in Blackout mode.

IMI Galil ARM - 5.56x45mm

"KN-57"

The "KN-57" is based on the 2015 prototype of the AK-12. It is a spiritual successor to the "KN-44" from Black Ops III. In Blackout mode, it is shown using "7.62mm" rounds, despite being clearly modeled with a 5.45x39mm magazine.

Prototype AK-12 - 5.45x39mm, 2015 model

Multiplayer character Nomad with his "KN-57".

First-person view of the rifle as Nomad is about to whistle to a K9 unit.

Mauser C96 Carbine

The Mauser C96 Carbine is available in the Zombies map "IX". It is depicted with a fully-automatic fire capability and a custom buttstock, and feeds from some kind of snail drum magazine.

Mauser C96 Carbine - 7.63x25mm Mauser

Winchester Model 1895

The Winchester Model 1895 is available in Blackout mode as the "Essex Model 07". It uses "7.62mm" rounds, which implies that it is the .30-06 Springfield version. The reloading process is incorrect, since the whole stripper clip is inserted into the chamber rather than just the rounds held in it.

Winchester Model 1895, commercial version - .30 Cal

Sniper Rifles

"Drakon"

The "Drakon", a WA 2000 / FG 42 based weapon from Black Ops III, appears in the Zombies map "IX".

Walther WA 2000 - .300 Win Mag

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FG 42 second model with bipod and bayonet deployed - 7.92x57mm Mauser

The "Drakon" being held by Stanton.

Machine Guns

Hotchkiss M1909

The Hotchkiss M1909 is available in the Zombies map "IX". It is incorrectly shown with a box magazine instead of a rigid strip.

Hotchkiss Model 1909 - 8x50mmR Lebel

Scarlett cocking her Mle 1909.

"Zweihänder"

The "Zweihänder", usable in the Blackout and Zombies modes, is a Maxim MG08/15-based machine gun in a shortened and somehow double-barreled form. It consists of an MG08/15's receiver combined with the aircraft sight and slotted barrel jacket of the LMG 08/15 (two jackets, actually). Its charging handle appears to be positioned further forward compared to that of a real MG08. It has a 75-round capacity, and uses "7.62mm" rounds, which would only be correct for Russian variants of the Maxim gun (chambered in 7.62x54mmR), although this choice was likely made for the sake of sharing ammunition with other 7.62mm weapons.

Maxim MG08/15 - 7.92x57mm Mauser

LMG 08/15 Air-Cooled - 7.92x57mm Mauser

The "Zweihänder" in the Chaos Story Trailer. In contrast to real MG08 variants, each barrel is exactly at the center of its jacket.

Mounted Weapons

GE M134 Minigun

A GE M134 Minigun is seen in the multiplayer beta trailer. The model features a two-disc barrel clamp as opposed to the traditional four-disc clamp.

General Electric M134 - 7.62x51mm NATO

M230 Chain Gun

An M230 Chain Gun is seen in the PC trailer.

Hughes/Alliant Techsystems M230 chain gun - 30x113mm B

Yakushev-Borzov Yak-B

A Yakushev-Borzov Yak-B is seen in the multiplayer reveal trailer.

Yakushev-Borzov Yak-B mounted on Mi-24 Hind-D - 12.7x108mm

The Yak-B mounted on a futurized Hind, which uses the same model from Call of Duty: Ghosts.