The Colt M1917 is a large-frame double-action revolver chambered in .45 ACP using half-moon clips to headspace the rimless cartridge, produced by Colt for the U.S. Army during WWI to supplement production of the M1911 semi-automatic pistol. Its robust construction and proven .45 ACP cartridge made it a reliable service arm. Type: Revolver Action: Double-Action/Single-Action Caliber: .45 ACP Capacity: 6 Year introduced: 1917, USA Weight: 40 oz Overall length: 10.8" Status: Discontinued Military use: Yes Intended use: military, collector