The Type 92 (Semi-rimmed) 7.7 mm (7.7×58mm SR) was a machine gun cartridge and was primarily used with the Type 92 Heavy Machine Gun and the earlier Type 89 flexible and fixed air-cooled machine guns used on Japanese planes.
Armament consisted of two 7.7 mm (.303 in) Type 89 machine guns, synchronized to fire through the propeller.
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