Selective-fire variant of the M1 Carbine with a selector switch allowing full-auto at 750 rpm. Used 30-round magazines. Conversion of M1s in the field or from factory. Used in the Pacific and Korea. Type: Carbine Action: Gas-Operated Caliber: .30 Carbine Capacity: 30 Year introduced: 1944, USA Weight: 58 oz Overall length: 35.6" Status: Discontinued Military use: Yes Intended use: military