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 Police Positive Colt Police Positive The Colt Police Positive is a small-frame, double-action revolver featuring a six-round cylinder, chambered for either .32 or .38 caliber cartridges. Designed primarily for sale to federal, state, or local law enforcement agencies, the Police Positive was introduced into the firearms market by Colt's Manufacturing Company in 1907. The Colt Police Positive was an improvement of Colt’s earlier “New Police” revolver, upgraded with an internal hammer block safety. Colt named this new security device the “Positive Lock”, and its nomenclature ended up being incorporated as a partial namesake for the new revolver. The cylinder of the Police