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
Comparison of the AK-47 and M16 Approximately 100 million AK-47 type rifles have been made worldwide. "The AR-15/M16-series rifles are considered the finest human-engineered assault rifles in the world." The M16 is ergonomically superior to the AK-47 in most respects. It is much easier and faster to change magazines and get the M16 back into action than with the AK-47. This is due to several factors, such as perfectly located magazine release and bolt release buttons, a flared magazine well for fast magazine insertions, and the ability to simply insert the magazine into the M16 in a conventional manner, rather than the "rock and lock" method