Colt Single Action Army was discontinued in 1999, as was the 4.75" variant, which was reintroduced in 2002. Manufacturing of the Colt Cowboy was discontinued in 2003. Colt engraved less than one percent of its first generation production of the Single Action Army revolver, which makes these engraved models extremely rare and valuable with collectors. Engraved pieces were often ordered by or for famous people of the day, including lawmen, heads of state, and captains of industry. This tradition began with the founder, Samuel Colt, who regularly gave such examples away as a means of publicity for Colt. Colt employed a number of engravers,
M1917 revolver and replace a range of 1890s-era .38 caliber Colt and Smith & Wesson revolvers that had demonstrated inadequate stopping power during the Philippine–American War. The Colt M1917 Revolver was essentially the same as the M1909 with a cylinder bored to take the .45 ACP cartridge and the half-moon clips to hold the rimless cartridges in position. In early Colt production revolvers, attempting to fire the .45 ACP without the half-moon clips was unreliable at best, as the cartridge could slip forward into the cylinder and away from the firing pin. Later production Colt M1917 revolvers had headspacing machined into the