That's where the difference between what is a right and what is a privelidge.
I don't think gun ownership is regulatable because it is a right.
Where as the ability to sell weapons is a privelidge and it can require licensing and regulation etc.
I don't think it would be possible to revoke that privelidge, though, without violating property rights.
But I do think it's possible to punish someone for not following protocols and regulations associated with that privelidge.
Selling guns is very similar to like selling alcohol or tobacco. Orignally I said "selling guns for profit" in this thread, which is different form the personal sale of a weapon.
Overall, I'm very much in support of gun rights as well as the ability to obtain gun.