Type Submachine gun Place of origin United States Service history In service 1942-1945 Wars World War IIChinese Civil War Production history Designer Carl G. Swebilius Manufacturer United Defense Supply Corp. Produced 1942–1943 No. built 15,000 Specifications Mass 4.54 kg (10.0 lb) Length 820 mm (32.3 in) Barrel length 279 mm … Continue reading United Defense M42