So I'm AR shopping looking pretty hard at the Rock River Arms guns and see in the rack a couple of AR Bushmaster "ban" years guns ie., lug/flash surpressor for $640. I figure I could always have a flashsurpressor put on. Though there is something about the ban guns that just put me off. But $640 for a very clean 16" seems like a good deal vs. $850 plus for a new RRA. What do you all think?