[["7.62 by 39mm ", 610.0], ["The AK-47, officially known as the Avtomat Kalashnikova, is a gas-operated assault rifle that is chambered for the 7.62\u00d739mm cartridge. Developed in the Soviet Union by Russian small-arms designer Mikhail Kalashnikov, it is the originating firearm of the Kalashnikov (or \"AK\") family of rifles.", 175.0]]
what caliber is an a. k. forty seven
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