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-12 to handle the extra bolt thrust produced by full-power ammunition. It features a long barrel, has a weight of with an empty box magazine and has a 20 or 30-round magazine capacity. In addition, the AK-308 uses a diopter sight line. It has the ability to attach accessories also used by the AK-12. The overall length of the rifle measures between . AK-12 The AK-12 is a Russian 5.45×39mm assault rifle, designed and manufactured by Kalashnikov Concern (formerly Izhmash). It is one of the modern derivatives of the Russian AK-Pattern series of assault rifles. Kalashnikov also offers the AK-12 in