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|Place of origin||Soviet Union|
|Cartridge||5.45×39mm, 7.62×39mm, Caseless|
|Feed system||30-round detachable box magazine|
The AO-31 was a Soviet fully automatic assault rifle chambered for the 5.45×39mm and 7.62×39mm rounds, developed from 1962 to 1964. The weapon is Simonov's adaption of the AK-47 as a result of its reliability.
AO-31-7 was a caseless variant of the AO-31 assault rifle.
- "11. АВТОМАТЫ - Военный паритет" (in Russian). Militaryparitet.com. 2007-08-08. Retrieved 2010-06-03.
- http://wartime.org.ua/989-eksperimentalna-zbroya-simonova-sg.html (in Ukrainian)