I'm pretty sure he can do as he wishes with it other than conceal it.
I was given a s&w model 22a as a high school graduation gift. I still have it. One of the smoothest shooting pistols I've ever shot. I have had other friends who own browning buck marks and ruger's who said my 22a was a better shooting gun.
I think redleg bought one for Zac as a graduation gift. I'm sure he'll testify to the credibility of them also.
Probably still being young, he'd have more fun and get more use out of a semi-auto than a revolver.
I say just buy him one. Sounds like he's a responsible kid.