ZPU-4

The ZPU-4 is aN anti-aircraft gun used in Call of Duty 4. It is one of the most prolific anti-air defenses in the world, with dozens of users all across the globe, with single and double barreled versions known as the ZPU-1 and ZPU-2 respectively, though only the four-barreled version is seen in the game.

Description
The ZPU-4 is derived from the Soviet KPV 14.5mm Machine Gun and first entered Soviet service in 1949. The quad version is mounted on a four-wheeled carriage with two legs that extend when the vehicle is ready to fire within 15-20 seconds, although the weapon can be fired in 'travel mode' without the stabilizing legs extended. It can fire a variety of ammunition. It has a firing rate of about 600 RPM for each barrel, but has only a practical firing rate of about 150 RPM.

History
The ZPU-4 has been used in a variety of conflicts since the end of the Second World War, first by Chinese and North Korean forces in the Korean War. It was later used in a variety of subsequent wars, including the Vietnam Conflict and Desert Storm. Although obsolete against most low-flying airplanes, it has proven to be quite effective against helicopters. Despite this, in many areas it has been replaced with the newer, more powerful ZU-23. It has also been mounted on vehicles.

In Game
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-Assad. 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.