As stated, the Richards conversion was only applied to the 1860. All others were Richards-Mason. I think what throws people about this is that the 1860 Richards-Mason used a new S-lug barrel, while the other models used the original percussion barrel. I've finally managed to snag an example of each type.
Most recent is a fantasy gun in the form of a Richards Type I conversion in .38Spl. An early Cimarron ASM gun that is an 1860/1861 hybrid. It's essentially an 1860 Type I but in .38Spl with a Navy grip.
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Another fantasy gun, a pseudo-1861 Richards-Mason. Actually an 1860 Richards Type II in .38Spl, fitted with a Navy grip frame and Uberti pearls.
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Cimarron's "Tuco Special", built on the Open Top cartridge frame in .45Colt with a Leech & Rigdon style barrel.
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My pair of 1860 Richards-Mason conversions in .44Colt.
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Whatever the hell this is. An ASM 1861 with a Legal Guardian gateless conversion and a non-functioning ejector. It's a paperweight.
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My early Cimarron 1860 Richards Type II .44Colt has been cut to 5.5" and fitted with giraffe bone grips.
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This is an 1851 Navy .38Spl conversion by Kenny Howell with a relined barrel.
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Uberti 1851 Richards-Mason conversion .38Spl from Dixie Gun Works.
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I've converted this aged Pietta with Kirst bits but it ain't ready for show business just yet.
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