WWII M1911A1 produced by Union Switch & Signal, a railroad equipment maker. Approximately 55,000 made — among the rarest of major contractors. Type: Pistol Action: Semi-Automatic Caliber: .45 ACP Capacity: 7 Year introduced: 1943, USA Weight: 38.5 oz Overall length: 8.5" Status: Discontinued Military use: Yes Intended use: Military Sidearm