Introduced in 1949 the ZPU-4 is a quad version of the basic Soviet 14.5mm machine gun. The ZPU-4 saw service with North Korea during the Korean War and with Iraq during the Gulf War. During the Vietnam war the ZPU-4 was considered to be the most dangerous anti-helicopter weapon of the war. Exported to numerous countries worldwide, the ZPU-4 was also manufactured in China as the Type 56.
The ZPU-4 system is made up four air-cooled, fully automatic 14.5mm machineguns mounted on a 4 wheeled, two axle chassis. While the ZPU-4 may be fired while limbered for traveling, the gun can be jacked off of the ground, using built in leveling jacks, for increased stability.