The ZPU-4 is a towed quadruple barreled anti-aircraft gun based on the Soviet KPV 14.5 mm machine gun. It entered service with the Soviet Union in 1949 and is used by over 50 countries worldwide. Double and single barreled version of the weapon exist - called the ZPU-2 and ZPU-1 respectively. Description Development of the ZPU-2 and ZPU-4 began in 1945, with development of the ZPU-1 starting in 1947. All three were accepted into service in 1949. Improved optical predicting gunsights were developed for the system in the 1950s. All weapons in the ZPU series have air cooled quick change barrels and can fire a variety of ammuniiton including API (BS.41), API-T (BZT), I-T (ZP) projectiles. Each barrel has a maximum rate of fire of around 600 rounds per minute, though this is practically limited to about 150 rounds per minute. The quad ZPU-4 uses a four-wheel carriage similar to that once used by

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