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Cimarron 1860 Richards-Mason .44 Colt & Russian Revolver 5.5" Barrel Conversion Model Walnut Grip Standard Blued CA931

- Caliber: 44 Colt and Russian
- Barrel Length: 5 1/2 inches
- Style: Cartridge Conversion
- Frame: Case Hardened Brass B/S - T/G
- Finish: Standard Blue
- Grip: 1 Piece Walnut
- Single Acton
- Fixed Sights
- 6-round Capacity

In 1871, Colt employee Charles Richards was awarded a patent for converting Colt percussion models to breech loading cartridge revolvers. The Richards cartridge conversion was an instant success. On July 2, 1872, William Mason, another Colt employee, was awarded a patent for an improvement to the Richards model. As percussion parts ran short, the 1860 Richards-Mason barrel was changed from the profile of the earlier percussion model, to the sleek profile found on the 1871-72 Open Top.