In 1871, Colt received an Army contract to convert one thousand Model 1860 Army percussion revolvers to use the .44-caliber centerfire cartridge being manufactured at the Frankford Arsenal. In 1872, Colt began filling civilian orders for thier metallic cartridge revolvers. These were an open-top conversion of the 1851 Navy. .38 Spec caliber, 5,5″ barrle length.
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