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How could an AK-47 switch between semiautomatic and fully automatic fire?

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Semiautomatic pistol — small arm Glock .40-calibre semiautomatic pistol.

The AK-47 is a gas-operated small arm designed to fire in either semiautomatic or fully automatic modes. The transition between these firing modes is controlled by a selector switch located on the weapon. By turning this switch, the operator changes the internal action of the rifle, allowing it to fire at a rate of 600 rounds per minute when set to fully automatic.12