AR Flat Top Upper Receiver, M-4 W/Feed Ramp Cuts
Machined, 7075, T6 aluminum, Upper Receiver, with a 5" long, flattop rail, accepts Weaver-style rings and your tactical accessories.
Finished with mil-spec, hard-coat, black anodizing for protection from scratches, mars, and abrasion, .250" (6.3mm) diameter pivot pin.
This M4 model has the feed ramp cuts in it.