Hi, I would like to buy a RRA 9mm upper. I see on your website you have them, but have the A2 10.5" listed twice. Is one of the listings suppose to be A3? Also is it possible to have the FSB removed and DD 9.0 or DD 10.0 installed(or similar unit) I intend to use a BUIS. Also if you can do this how long of a wait could I expect? Thanks for your time.