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 M1889 Colt M1889 The Colt Model 1889 was a revolver produced by the Colt Manufacturing Company in the late 19th century. In the mid 19th century, Colt manufactured revolvers for the Army and Navy that were based on a design by William Mason and Carl J. Ehbets. William Mason left Colt in 1882 to work for Winchester, but Ehbets remained at Colt, and continued to refine the design that they had collaborated on. These refinements led to the Model 1889. Colt was the first manufacturer to produce a revolver with a swing-out cylinder. Smith & Wesson followed seven years later with