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-9 It is one of the latest models of the popular Kalashnikov rifle series. It is based on the AK-100 series, which is a modernization series of Kalashnikov assault rifles. A unique feature of the rifle is the use of the special subsonic cartridge 9×39mm SP-5, SP-6. According to its characteristics it competes against the 9A-91, AS Val and SR-3M, but has seen limited use compared to these counterparts, which have already seen service in Russian military and police units. In 2006, Russian authorities wanted the Izhmash factory to design a rifle with Kalashnikov properties, but suitable to be used in