What is required by law?

[Indirect Fire]

**** the ATF and Merry Christmas

 

[Thomas Eeyore]

If I wanted to offer gunsmithing services what would I be required by law to have.
I can parkerize, and build aks. So I was thinking if I offered a service to repair, not build aks. I only ask because a local shop I had previously spoke with claimed to have the ability to repair, service weapson. But a customer came in asking g if they could rivet a sight rail on and they said no. Well I can and it's easy. So what would I have to have legally, or where would be a good source to check... I guess the ATF?.
Any thoughts or ideas..

I know my gunsmith has to be insured just like aircraft mechanics.

 

[Edgee2004]

Ok cool I am already insured as an A&P working towards my IA.