The AK-47 is a 7.62 mm assault rifle developed in the Soviet Union by Mikhail Kalashnikov. Design work on the AK began in 1944. In 1946 the rifle was presented for official military trials, and a year later the fixed stock version was introduced into service with select units of the Red Army (the folding stock model was developed later). The AK-47 was officially accepted by the Soviet Armed Forces in 1949. It was also used by the majority of the member states of the former Warsaw Pact. The AK-47 was also used as a basis for the development of many other types of individual and crew-served firearms.
It was one of the first true assault rifles and, due to its durability, low production cost and ease of use, remains the most widely used assault rifle in the world - so much so that more AK-type rifles have been produced than all other assault rifles combined.