1825 ca. - Percussion-cap guns are in general use. 1830 - The back action lock appears. 1835 - The first Colt revolver. Samuel Colt developed the first mass-produced, multi-shot, revolving firearms.

36 caliber 1851 Navy Colt revolver. This gun was named for its ... 45 Peacemaker, which combined the bullet, gunpowder, and percussion cap in one cartridge and was therefore much easier to reload.