TAB points out the grey area. I have sent pistols off for service, just overnight mail. The factory sends them back directly to me. No FFL and no dealer fees and perfectly legal. Now, I NEVER go USPS. Always UPS or Fed EX. You have to declare its a gun, and they can't mark it as such on the package. Now, if dear old dad were to ship you a fishing reel via UPS........

But you would, hypothetically speaking, be violating the law and the $50 transfer fee is a lot cheaper than a lawyer. If you want to keep it off the books, a family reunion would be the best way to go.
FQ13