The AR-STONER AR-15 A3 Upper Receiver Assembly is ready to be assembled to a complete lower and fired! This AR-STONER upper features a carbine gas system, a mil-spec bolt carrier group, a heavy contour barrel and a free float, AR-Stoner Ultralight M-Lok handguard. Securely mount popular accessories directly to the precision M-Lok cutouts and attach your sling to the integrated QD mounts with this optimum handguard. This sleek and ergonomic free float handguard meets shooters needs without sacrificing strength and performance. The A3 upper assembly will attach to virtually any standard AR-15 lower receiver and comes complete with charging handle, forward assist, ejection port cover, A2 flash hider, bolt and bolt carrier assembly. Supplied without sights, this upper is a great platform for a red dot sight or iron sights (both sold separately).FeaturesComplete Bolt Carrier Group10" M-Lok Ultralite Handguard10.5" Barrel Flash Hider