“No. He loses his right to possess a gun.”
Same thing. As they used to say in the 19th century, “God made man, but Sam Colt made them equal.”
No gun, no self-defense. One’s right not to be killed is nullified.
(shrug) That's the criminal's problem.
He shouldn't have used a gun to rob somebody if he didn't want to lose the right to possess one. Tough crap for him.