Complete AR-15 Flat Dark Earth 5.5″ 9mm Pistol Upper w/ 4″ Slim M-Lok Hand Guard This is a complete AR15 pistol upper chambered in 9mm. *For 9mm Glock and Colt SMG Mags.* Bolt carrier group and mil-spec charging handle are included. This pistol upper will match up with any brand 9mm lower receiver. Glock and Colt SMG magazines will function perfectly with any mil-spec AR15 lower using one of our magwell adapters. (See other listings.) This complete upper features a dual Glock/Colt compatible bolt carrier group. The upper receiver is T6 6061 billet with 1913 picatinny rail flat top. It includes a matching 4″ free floating M-Lok hand guard. Both upper receiver and hand guard have a durable flat dark earth (FDE) cerekote finish. The 1:10 twist 5.5 inch barrel is 4150 chrome moly vanadium, Nitride coated and made for us to our specifications. It is tipped with an indexed A2 flash hider/suppressor threaded 1/2″-36. Because this 9mm upper uses its own generated energy to cycle the next round, there is no need for a gas system, thus making it lighter. Lighter than most other AR pistol uppers! This high quality upper will match up with any brand 9mm lower receiver. It is complete and ready to shoot! Comes with the Barrier Defense lifetime warranty!  ****Know your states laws when purchasing gun parts.****