If a person has been convicted of a crime and has completed his sentence, why is he banned for life from owning a firearm? That is extra-judicial reprisal. And if a person convicted of a crime can be denied his right to own a firearm, he can also be denied his right to a lawyer, his right to a jury trial, or his right to practice his religion. The government doesn't have the authority to deny any Citizen his rights unless it is part of the sentence of the Court. When the sentence is served, the loss of rights is over also.