ZPU-4

The ZPU-4 is an anti-aircraft gun in Call of Duty 4: Modern Warfare, Call of Duty: Modern Warfare 2, and Call of Duty: Black Ops.

Call of Duty 4: Modern Warfare
The ZPU-4 is used by OpFor forces in the Middle East during the invasion of a small Middle Eastern nation under the control of Al-Asad. During the mission The Bog, Paul Jackson is tasked with destroying a ZPU-4 in order to allow AH-1 Cobra helicopters to come in and secure the area to rescue a stranded tank, War Pig.

It is most likely that tens of other ZPU-4s are firing throughout the mission Bog and multiplayer level of the same name. They usually fill the night, firing at the skies above, though the player does not see much aircraft going about. In the mission Shock and Awe, ZPU-4s will fire at Paul Jackson while he is using the Mk 19.

Call of Duty: Modern Warfare 2
The ZPU-4 appears in the level Exodus, where it is being used by Russian paratroopers to destroy American air support. On the multiplayer map Afghan and on the roofs of buildings on the multiplayer map Strike.

A model of the ZPU-4 can be found in a glass display case in the Museum level.

Call of Duty: Black Ops
In Call of Duty: Black Ops it appears in levels Operation 40, The Defector, Payback and Redemption. During Operation 40, Mason's team gets pinned down during their escape plane taxiing and Mason jumps from the plane to control the ZPU and destroy enemy vehicles. It can also be seen in the maps Havana and Jungle.

Trivia

 * When firing the ZPU in Operation 40 in Black Ops, it has the same firing sound of that from the Spas-12.