I returned that upper and Noreen arms sent me another but surprisingly it was worst off then the one I sent back. It would not align with the takedown pin holes so I sent them pictures of their lower and a Aero percission upper which was perfect alignment. Their reply was, send back their lower ( which is now registered in my name) so they can evaluate the situation. Absolutely not! For fear of what that might lead too, and beside, how can I, not being able FFL licensed dealer send it? Oh they were willing to send me a shipping label but I wasn't putting myself out on a limb ready to be cut down.My reply was to Noreen was, you get what you pay for and that was a pair of attractive paper weights.