After World War I, the revolver gained a strong following among civilian shooters. 45 ACP cartridge and used half-moon clips to hold the rimless cartridges in position. It was simply a New Service re-chambered to take the. The Colt M1917 revolver was created to supplement insufficient stocks of M1911 pistols during World War I. 45 Colt version with a 5½' barrel, was adopted by the U.S. The Colt New Service is a large frame, large caliber, double-action revolver made by Colt from 1898 until 1941. 357 Magnum as well as other less common calibers.
