Rock River Arms RRA Forged A4 Upper Receiver Assembly AR15 AR-15 with Forward Assist and Port Cover Installed
Excellent Quality, forged, assembled upper receiver is CNC machined to tighter than mil-spec tolerances, with critical contact points held to +/- .0005". Accepts all aftermarket and mil-spec parts. A4 is flattop style with multiple cross-slot, Weaver-style base for mounting optical and iron sights. RRA makes a great product!
SPECIFICATIONS: 7075-T6 aluminum, black, hardcoat anodized, matte finish, M4 Feed Ramps.