Get started on your new AR-15 build with this Aero Precision Barreled Upper Receiver. It features a 16” barrel chambered in 5.56 NATO. It features a pinned front sight gas block and carbine length gas system a Magpul MOE SL M-LOK handguard. The upper receiver is forged from aluminum to Mil-Spec dimensions and hardcoat anodized black. Pick out your favorite bolt carrier group and charging handle and you have a complete upper receiver.