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,
History of the New York City Police Department standard issued revolver for the NYPD. It was the Colt New Police Revolver in .32 Long Colt caliber. He also instituted required firearms training including pistol practice and qualification for officers. In 1907 the Colt Police Positive revolver in .38 caliber was adopted by the department. In May 1926 the NYPD adopted the .38 Special cartridge as the standard issue ammunition for the department and started issuing its officers the Smith & Wesson Model 10 revolver and the Colt Official Police revolver. In 1994 the NYPD replaced the revolver as its main service weapon and adopted the 9mm semiautomatic pistol