The Johnson M1941 was an American light machine-gun of the Second World War produced from 1941 to 1945. It was chambered for the 0.30 inch calibre US Service cartridge which it took from a 20-round box magazine, and fired at a variable rate of between 200 and 900 rounds per minute. Prone to jamming during prolonged use, they were intended to be supplied to the Dutch East Indies, but the Japanese invasion meant they were issued to the US Marine Corps and special forces. Research Johnson M1941