3, 1869), a number of Navy 1861 and its forerunner, the Colt 1851 Navy Revolver were converted or newly made to fire .38 rimfire or centerfire cartridges, the Colt Model 1861 Richards- Mason Conversion by the Colt factory.
The Colt Model 1861 Richards-Mason Conversion, a modification of Navy revolvers from 1861 and its predecessor, the Colt 1851 Navy Revolver, was adapted to fire .38 rimfire or centerfire cartridges.