The AR-STONER AR-15 Upper Receiver assembly chambered in 5.56x45mm delivers precision accuracy at an affordable price. The forged aluminum upper receiver is combined with an extruded aluminum free float M-LOK handguard and both are Type III hard coat anodized. This complete upper features a mid length gas system, 16” heavy-profile barrel, 15” free float AR-Stoner M-LOK handguard and a flash hider. Attach your favorite sling to the free float handguard with QD mounts and use the precision M-LOK cutouts for mounting MIL-STD 1913 Picatinny rails or other direct-attach M-LOK accessories.