I can see the tool mark on the case thing to a point but wouldn't a lot of those scratches not be the same as he drop in barrel has the new and improved chamber that the case goes in and out of? And the exreactor wouldn't look all that much the same on a different caliber. Maybe one of those 357 Sig/40S&W things?
I'm far form being really in the know about such things but it seems that the only place that would be consistant at all would be on the case rim. Robo, being your experience in such matters I have to trust your judgement on the issue. But it just don't seem like it would work that consistently.
I'm sure I'm overlooking something.
As to the conversion bbl; Really any bbl. that can be dropped in to attempt to cover a bad persons tracks. Gave a Glock19? get get another barrel of the same caliber.
Lets say for the sake of argument that this trick would fool all those TV CSI people. Would it be justifiable to discipline the good guy gun owner for the misdeeds of the bad people? It's this mind set that gets gun control laws passed. Someone could spray a bunch of people with a Tommy Gun. So is it fair to make laws that restrict the ability to own one even if you have no intention. of spraying lead into a crowd?
Curtailing our liberties for the sake of security is just a tactic used by those that wish to control us.