This upper is superb, fit and finish is excellent. Grid Defense shipped upper in 3days. Would recommend to any one who wants a superior upper at a great price.

This upper receiver far exceeded my expectations! I’d give it 10 stars if I could! Bought to change my AR 5.56 to a 300 blackout so my 7 year old could hunt with it this year. First of all it looks amazing. Second of all the price is unbeatable. Third of all it’s super accurate. I don’t consider myself a marksman by any means but I had bullet holes touching at 100 yds! If I ever need another upper or barrel this will be the first place I look!

This is my second 300 blackout upper. I put it on a DPMS lower with a 1x4 Leupold vxr scope. I am getting less than halfway inch groups at 50 yards. I am shooting 220 grain Sierra roundnose bullets with 9.2 grains of H110. The fit and finish of the upper is excellent.

I put this upper on a Rock River lower with an Aimpoint sight and I get about a 1 inch group at 50 yards. I am shooting Sierra 220gr round nose bullets with 9.2 grains of H110.