I like to support the local businesses and can recommend Rusty Oak Armory.
He works out of his house but does NFA engraving (20 dollars), FFL transfer and background (20 dollars total). He is also able to do some smithing and builds his own stuff. Some Country celebs use him since he’s pretty low key. By appointment only since he does some class 3 stuff and a lot of work for local LE. I recently did a FFL transfer with him and it was super smooth and cheap, thought I would pass it along.

Yup!  Jeff is a good man and does excellent work.

Office is in his home, but he does have a fully equipped shop next to the house.

Located in Mt. Juliet.

https://rustyoakarmory.com/

615-619-3409

Yep, and like 10 min from me, good stuff and great guy.