I've looked and the only one who is good is 'ChuckInDenver' and BP Tactical can get you his contact info.
There's also Glenrock bluing or something like that in Glenrock WY that has a great rep as far as I know.
There's some gunsmithing school here in Denver but from what I've heard I'd stear clear of them. No experience, just things I've heard.
If you pick one and have the work done let us all know how it went.