I used Gander Mountain gunsmith services, here in Michigan. Not a very good experience.
I had a fixed choke barrel for a Remington 870, and wanted screw-in chokes installed. I took it to the Novi, MI, store, and they sent it to Wisconsin. It sat there for almost nine weeks. Turns out that the barrel's fixed choke was too tight for standard screw-ins, and it needed thin wall chokes. Without asking me, the 'smith at Novi told them to put in the thin walls. When I got it back, they had installed a improved cylinder choke. Oh, I told them at the outset that the barrel was to be used on a trap gun.
I complained to the shop manager, and sent an email to the shop in Wisconsin. They next-day shipped full, and imp-mod chokes at no extra cost.
The gunsmith at the local store ended up losing his job over this, but I suspect this wasn't the first time he failed to contact the customer.
They made good on the screw-up, but nine weeks is a bit long, even allowing for summer vacation.