The AR-STONER AR-15 Upper Receiver provides style, function, affordability to your AR-15 Pistol. The A3 upper attaches to virtually any standard AR-15 lower receiver. Machined with 300 Blackout feed ramps, this upper features an M-Lok handguard and 4150 Chrome Moly Vanadium barrel with a matte finish to top it off. M-Lok Handguard slots allow mounting of popular M-Lok compatible accessories directly to precision cutouts and features integrated QD sling mounts with a sleek design that does not sacrifice strength or ergonomics. FeaturesM-Lok railA3 flat-top forged upper receiver with forward assistFlash HiderCharging Handle