The improved 1911A1 as manufactured by Colt — arched mainspring housing, shorter trigger, enlarged ejection port relief cuts, and grip safety spur added. Type: Pistol Action: Semi-Automatic Caliber: .45 ACP Capacity: 7 Year introduced: 1924, USA Weight: 38.5 oz Overall length: 8.5" Status: Discontinued Military use: Yes Intended use: Military Sidearm