“Actually, it’s not just new firearms. In theory, he must surrender the ones he has. He is considered a ‘Prohibited Person’.”
Nope he can keep and ee acqire all the new guns he wants. The ONLY thing he cant do is concealed carry.
He could even still apply for a class III weapons permmit for a full auto or a supressor. Probably wouldn’t be approved but he can still apply for it.
Sorry, yes, a quick scan of the laws shows you are correct.