I have had good luck with Bozeman Trail Arms, Mfg with my replica cowboy guns. Tom Sargis has always done a good job on my Colts and Remington sixguns. His e-mail address is [email protected] . He does a lot of "Duke" Venturino's guns out in Montana. Drop him a line, he usually will answer in a day or two.
If you want the best to work on your old S&W or one of the modern clones, send it to David Chicoine. He has, literally, written the book on working on these!