Hypothetical situation: smith logs AR into his books, does work, calls customer to pick it up. Something happens to the customer where they cannot pick the firearm up. Customer sends wife. Smith has to 4473 the AR to the wife along with background check. This would put him in violation of BS, would it not?
That's a happy fun ball situation that I've never heard of before, but it's worth exploring, legally. I'm not sure if there are insane requirements surrounding repairs.
-Mike