Craig, all asked and answered. Not my problem if you don't like the answers. The system--requiring reproof for guns that undergo various types of modification, such as chamber lengthening--works well in the UK. Why wouldn't it work equally well here?
And you can make shade tree bubba follow the rules the same way we make car dealers follow the rules about not turning back the odometer. The problem is, right now we have too many "shade tree bubbas" punching chambers that should not be punched. Good idea, IMO, to reduce the likelihood of that happening to guns that should not be modified--and present more of a safety hazard after modification than they did before. Used to be lots of people didn't wear seat belts. Lots more of them wear them now. All of these are good things, IMO.
