Samuel Colt new revolver had a stationary trigger and was in a larger caliber. Colt submitted his single prototype to the War Department as a "Holster revolver". Captain Samuel Walker of the Texas Rangers had acquired some of the first Colt revolvers produced during the Seminole War and saw first-hand their effective use as his 15-man unit defeated a larger force of 70 Comanche in Texas. Walker wanted to order Colt revolvers for use by the Rangers in the Mexican–American War, and traveled to New York City in search of Colt. He met Colt in a gunsmith's shop on January 4, 1847,
Colt Walker martial pistols and revolvers, was a practical weapon out to about 100 yards. The Colt Walker holds a powder charge of in each chamber, more than twice what a typical black powder revolver holds. It weighs unloaded, has a barrel, and fires a .44 caliber ( diameter) conical and round ball. The initial contract called for 1,000 of the revolvers and accoutrements. Colt commissioned Eli Whitney Junior to fill the contract and produced an extra 100 revolvers for private sales and promotional gifts. Notable recipients include John Coffee Hays. Colt commissioned New York engraver Waterman Ormsby to etch a scene