I believe Dixie, and others have some replacement parts, to change a TC Hawken to iron parts. My guess is that they would have to be fitted, browned or blued, and you would still be stuck with the brass patch box. I assume the entire rifle would have to be refinished. Cold blueing will turn the brass somewhat black, giving a aged patina look, and Birchwood Casey, has a brass black. I didn't see much difference in the cold blue vs. brass black stuff.