Colt Walker of Texas had been the major purchaser of the early Paterson Holster Pistol (No. 5 model), a five shot cal .36 revolver, and Samuel Walker became familiar with it during his service as a Texas Ranger. In 1847, Walker was engaged in the Mexican-American War as a captain in the United States Mounted Rifles. He approached Colt, requesting a large revolver to replace the single-shot Aston Johnson holster pistols then in use. The desired .44-.45 caliber revolver would be carried in saddle mounted holsters and would be large enough to dispatch horses as well as enemy soldiers. The Colt Walker
Colt Open Top Pocket Model Revolver them by 1877. The Open Top Pocket Model was chambered in .22 Short and .22 Long, both using black powder as the propellant. It was equipped with a 7-shot non-fluted cylinder and two different barrel lengths: 2-3/8″ and 2-7/8″. NOTE: It is highly questionable that modern .22 ammunition would be safe to use in antique firearms. Colt Open Top Pocket Model Revolver The Colt Open Top Pocket Model Revolver was a single action pocket revolver introduced by the Colt's Patent Fire Arms Manufacturing Company in 1871. Introduced a year before the Colt Open Top (a model from 1872) and two