What parts of the original S&W New Model #3 are interchangeable with the modern Navy Arms New Model Russian in 44 Russian or the Uberti New Model #3? Specifically, would the barrel portion and the cylinder by interchangeable? I'm thinking of purchasing an old beater New Model #3 where the barrel is thrashed, the cylinder is not so great, and the ejector needs replacing. Could I get modern parts to repair it?