Gepard (submachine gun)

The Gepard (Cyrillic: Гепард, Cheetah) is a Russian submachine gun developed by the military unit 33491 and JSC REX first presented in 1997 Moscow. The gun was developed as an answer to a shortage of 9mm ammunition.

Development
Developed from the AKS-74U the Gepard has 65% parts commonality, it can use the .380 ACP, 9×18mm Makarov, 9×19mm Parabellum, 9×19mm 7N21, 9×21mm and 9×21mm Gyurza without a change and can use the 9×30mm Grom cartridge with a chamber replacement. The gun can use different mechanisms of action: The receiver is shorter compared to other Kalashnikov plattforms, a special counter-balancing system can be used. Various barrel accessories such as muzzle brakes, flash hiders and suppressors can be attached to the barrel. The double-stack magazine presses the rounds against the front wall. Unusual for Kalashnikov rifles the magazine is placed inside the grip similar to the ST Kinetics CPW and the grip is made from polymer.
 * blowback
 * blowback with 2 inertial masses
 * blowback with 2 inertial masses and partial use of the gas from the barrel
 * delayed blowback
 * typical kalashnikov Long-stroke piston with rotating bolt