I am pretty sure this idea has crossed all of our minds before. It would be a good idea, there is the whole problem of you now possessing an illegal firearm, as usually they are or intended to be. I don't think you would have a problem with the officers until they came over and said, "hey thats an illegal SBS or SBR, congratulations your under arrest for purchasing an illegal firearm." or something to that extent. Now I have often considered going to a gun buy back thing, and offering to buy some of the more valuable ones for twice what the paid for them, I mean take a firearm from someone who legally can't own one, sell it for profit to someone who can own one, then use the money for police needs. Win-win-win, to bad the liberals would have a poop fit because they want our guns too. Maybe once I become a member of my law enforcement community I'll put some pressure to get a program like that started.