Firearm a battle rifle such as the Karabiner 98k, but the chief differences defining an assault rifle are select-fire capability and the use of a rifle round of lesser power, known as an intermediate cartridge. Soviet engineer Mikhail Kalashnikov quickly adapted the German concept, using a less-powerful 7.62×39mm cartridge derived from the standard 7.62×54mmR Russian battle rifle round, to produce the AK-47, which has become the world's most widely used assault rifle. Soon after World War II, the Automatic Kalashnikov AK-47 assault rifle began to be fielded by the Soviet Union and its allies in the Eastern Bloc, as well as
AK-101 AK-74M is still the main assault rifle of the Russian Federation, with the AK-105 being introduced alongside, both chambered for 5.45×39mm. The AKM firing 7.62 mm Soviet rounds is in limited service with selected units in the Russian army, and the AK-103 is in service with some Russian civil police agencies and spec ops units. The advanced AN-94 is entering limited service in the elite forces of the Russian military, some Russian police forces, and the Ministry of Internal Affairs. The AK-101 is a selective fire weapon that can be fired in either semi-automatic or fully automatic mode. The disassembly