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
Samuel Colt After his revolvers had gained acceptance, Colt looked for unsolicited news stories containing mention of his guns that he could excerpt and reprint. He went so far as to hire agents in other states and territories to find such samples, to buy hundreds of copies for himself and to give the editor a free revolver for writing them, particularly if such a story disparaged his competition. Many of the revolvers Colt gave away as "gifts" had inscriptions such as "Compliments of Col. Colt" or "From the Inventor" engraved on the back straps. Later versions contained his entire signature which was