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 1851 Navy Revolver sighting arrangement, these revolvers and their modern replicas generally are quite accurate. The first metallic cartridge revolver made by Colt was the Thuer-Conversion Model Revolver, a design that would not require a cylinder with cylindrical chambers so as not to infringe on the Rollin White patent. A small number (about 1000–1500) of Model 1851 Navy revolvers was converted, using front-loaded, slightly tapered cartridges to fit the chambers of the cylinder reamed to a slight taper. After the expiration of the Rollin White patent (April 3, 1869), Colt 1851 (and 1861 Navy) Revolvers were converted or newly made to fire .38