This is the Kirst Konverter-Ring with the loading gate only for 1861 or 1851 Colt made by Pietta. If you have already installed the older Kirst Konverter with out a loading gate then this can be installed with some modification to your pistol to load using a loading gate. All Kirst Cartridge Konverters are precision CNC machined in the USA from 4140 steel and heat-treated. This must NEVER be installed in brass frame revolvers. Lifetime manufacturers warranty.