Del Whitman can do it all. Relay ribs, browning and engraving. His engraving is exceptional btw and I've been 100% satisfied with all of the work I've had him do. Another name is Barry Lee HandsAnd yet another top notch dude. Ron Collings is retired I believe, which is a shame, damn he was good.
I recently had a set of pins, top lever, trigger guard bow and a hinge pin engraved by Lee Griffiths in Utah....he's on a different level artistically speaking. Absolutely amazing talent.
The recommend for Gournet is completely sound. He's a good dude and he flat out is a master at his craft.
Lots of excellent choices out there. Another Utah engraver, S. Welch is a poster here on the board, I've seen his work and it too is exceptional.