Aero precision is quality! - Aero Precision M4E1 Threaded Assembled Upper Receiver

First time building an upper and I did it with all Aero parts. Everything fell right into place, no issues at all. No blemishes or burrs, no discolorations or bent threads, just perfect. I would recommend to anyone building an upper or upgrading your existing upper. I had an Aero upper with an Enhanced hand guard on a 14.5 p&w with Epsilon 556 SL, but didn’t care for the width of the hand guard. Can’t change the hand guard on those models so I built an identical upper I could put an R-one hand guard on.