Eugene Reising's compact submachine gun, adopted by the US Marine Corps early in WWII and by FBI agents when Thompson supplies were insufficient. A unique delayed-blowback mechanism made it more accurate than the Thompson but also more sensitive to fouling — it earned a terrible combat reputation in the Pacific where jungle mud caused frequent stoppages. Marines at Guadalcanal reportedly threw them into the ocean and found captured Japanese weapons preferable. Type: Submachine Gun Action: Semi-Automatic Caliber: .45 ACP Capacity: 20 Year introduced: 1940, USA Weight: 88 oz Overall length: 24" Status: Discontinued Military use: Yes Intended use: military, law enforcement