The Bizon's operating cycle is characterized by a very short recoil stroke, standard 9x18mm ammunition will only drive the bolt partially to the rear of the receiver and produces a cyclic rate of 700 rounds/min. The Bizon uses a simple straight blowback method of operation, an unlocked breech system reduces cost and build complexity. Chambered for the standard Russian 9x18mm Makarov pistol cartridge, the gun will also fire a new high-impulse armor-piercing 57-N-181SM round. It is based on the AKS-74 and features a 60% parts commonality with the assault rifle. The Bizon is a lightweight selective fire weapon that fires from a closed bolt, a feature that enhances the gun's accuracy. It was used in combat operations against separatists in the volatile North Caucasus region, namely Chechnya and Dagestan. The Bizon is issued to armed response units of the Federal Security Service (FSB) and Ministry of Justice. Prototypes were trialed by the Special Equipment Research Institute in 1995 where they outperformed several competitors, and the weapon was accepted into service on December 28, 1996. The Bizon was developed at the request of the Ministry of Internal Affairs (MVD) and is primarily intended for counter-terrorist and law enforcement units that require fast and accurate fire at close ranges. Alexi Dragunov, youngest son of Evgeny Dragunov (responsible for the SVD sniper rifle), was also a member of the design team. The PP-19 Bizon ("Bison") is a 9mm submachine gun developed in the early 1990s at Izhmash by a team of engineers headed by Victor Kalashnikov (son of famed AK-47 designer Mikhail Kalashnikov).
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