AK-74 be used by the majority of countries of the former Soviet Union. Additionally, licensed copies were produced in Bulgaria (AK-74, AKS-74 and AKS-74U), and the former East Germany (MPi-AK-74N, MPi-AKS-74N, MPi-AKS-74NK). Besides former Soviet republics and eastern European countries, Mongolia, North Korean Special Forces, and Vietnamese People's Naval infantry use AK-74s. The AK-74 was designed by А. D. Kryakushin's group under the design supervision of Mikhail Kalashnikov and is an adaptation of the 7.62×39mm AKM assault rifle and features several important design improvements. These improvements were primarily the result of converting the rifle to the intermediate-caliber high velocity 5.45×39mm cartridge.
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