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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 in the Soviet documentation as Avtomat Kalashnikova (Russian: Автомат Калашникова). It is also known as Kalashnikov, AK, or in Russian slang, Kalash. No number was present in the Soviet military nomenclature for Kalashnikov's assault rifles until the adoption of the AK-74.