Cimarron Firearms 1860 Richards-Mason 45 Colt (Long Colt) Revolver 5.5" Blued Barrel 6 Round Walnut Grip

Patented July 2, 1872, Colt employees Charles B. Richards and William Mason, combined their ideas for converting Colt's percussion revolvers to self-contained metallic cartridge, breech loading arms. Originally working with the percussion arms parts already in stock, guns were converted, however as they began to run out of the cap and ball components, the company began producing new sixguns as metal cartridge arms, rather than conversions. Although the numbers produced only amounted to a few tho