The guy who sold you that gun will probably do it again, and next time the person he sells it to will use it to commit some horrific crime and the law abiding folks will be punished by more restrictive laws. This is a perfect example of lack of enforcement not lack of laws.
Sorry for the rant.
P.S. Martin you did the right thing. One way or another, you hanging on to that thing was going to bit you in the butt.
Marc