AO-31
Encyclopedia
The AO-31 was a Soviet fully automatic assault rifle
Assault rifle
An assault rifle is a selective fire rifle that uses an intermediate cartridge and a detachable magazine. Assault rifles are the standard infantry weapons in most modern armies...

 chambered for the 5.45 x 39 mm round, developed in 1965. The weapon is Simonov
Sergei Gavrilovich Simonov
Sergei Gavrilovich Simonov was a Soviet weapons designer; he is one of the fathers of the modern assault rifle....

's adaption of the AK-47
AK-47
The AK-47 is a selective-fire, gas-operated 7.62×39mm assault rifle, first developed in the Soviet Union by Mikhail Kalashnikov. It is officially known as Avtomat Kalashnikova . It is also known as a Kalashnikov, an "AK", or in Russian slang, Kalash.Design work on the AK-47 began in the last year...

platform as a result of its reliability.

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