"The 2B-A-40 is an assault rifle of Russian origin of 1956. The weapon uses a delayed-blowback operation and is chambered in the 7.62x39mm round.Later in the 1960's the 2B-A-40 also came as a light machine gun as the 2B-P-40.In the 1970's the 2B-A-40 added combined Assault Rifle/Grenade Launcher based on the AK platform.