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
Oficial AK-47 (Black Terry, Dr. Cerebro and Cerebro Negro). Los Oficiales continued to defend the IWRG Trios title through 2009 and into 2010, and by April 21, 2010, had made at least nine successful defenses of the title, more than any previous title holder. Their success has also seen them named the best version of Los Oficiales. Oficial AK-47 has also achieved individual success, including winning a number of "Lucha de Apuesta" or bet matches. On December 21, 2008, AK-47 and Arlequin were the last two wrestlers in a 10-man Steel Cage match and thus were forced to wrestled for their mask