I don't believe that. What if you suddenly determine that the AR that you just bought turns out to be defective and is a piece of crap. You want to get rid of it as soon as possible and some guy wants it for parts only. So what if you do make some big bucks on it - it would be a one time type transaction and not a regular thing of making profit........ If making some profit on an occasional firearm sale is illegal, there will be a hell of a lot of guys seriously breaking the law.