It doesn't matter if someone isn't convicted of violent crimes. Criminals are criminals. They have forfeited their RKBA, and I don't have any problem with putting the onus on criminals to make sure that they have followed the law, and relinquished all their guns and gun parts.And some of this stuff is nuts. I was at a trial as an alternate juror where a guy with a record was sent back to jail for a few years because he had the barrel of a 22 rifle in a box of junk. And he had never been convicted of any violent crimes. Sometimes these laws are used to "get" someone the cops and prosecutors just don't like. The guy was a pretty sleazy guy, but years for a rifle barrel? It seemed, and still seems after a few years, nuts to me.
Have you ever heard Bernard Kerik tell his story of what he learned in jail? It's a fascinating story. Here's a link to a talk he gave on what he learned. https://www.youtube.com/watch?v=_9nAnEegryk
But for a .22-caliber barrel only, that does seem excessive, all other things being equal. But it doesn't sound like all other things were equal: "The guy was a pretty sleazy guy..." :idunno: