Where you at?
Wilson, Ed Brown, Clark are some I would go to for usual work. There are others like Heirloom, Novak. Or check the smith's in your hometown. If they can't do the work, they normally know someone who can.
The big thing is to:
1. Know exactly what work you want done.
2. Know how long it will take.
3. Know how much it will cost.
4. Have a written quote stating exactly what, how much, where the parts come from.
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
Life Member NRA
Life Member NAHC
Former President of the ECPT (Eifel Combat Pistol Team)