The AR-STONER AR-15 Optics Ready Upper Receiver Assembly is a quality upper receiver at an exceptional price. The A3 upper attaches to any standard AR-15 lower receiver and comes complete with charging handle, forward assist, ejection port cover, bolt and bolt carrier assembly. This carbine length upper features a 16-inch government profile barrel with durable phosphate finish. The low profile gas block makes this upper a fantastic platform for a red dot sight or scope. Build a reliable AR at a price that won't break the bank with the AR-STONER AR-15 Optics Ready Upper Receiver Assembly.FeaturesComplete Bolt Carrier GroupLow-Profile Gas BlockA2 Flash Hider16" BarrelChambered in 5.56x45mm NATO