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 M1861 Navy Colt M1861 Navy The Colt Model 1861 Navy cap & ball .36-caliber revolver was a six-shot, single-action percussion weapon produced by Colt's Manufacturing Company from 1861 until 1873. It incorporated the "creeping" or ratchet loading lever and round barrel of the .44-caliber Army Model of 1860 but had a barrel one half inch shorter, at 7.5 inches. Total production was 38,000 revolvers. Like its forerunner, the Colt 1851 Navy Revolver, it saw widespread use in the American Civil War and on the American Western frontier, though far fewer were produced. It has the same general specification as the earlier model,