Complete 16″ 300 Blackout Upper with 15″ Slim Flat Dark Earth Air Lite M-Lok Hand Guard This upper includes a 16″ barrel tipped with an A2 flash hider/suppressor. Reliable pistol gas system to cycle all ammo. A3 upper receiver comes with forward assist and ejection port cover installed. Barrel and receiver have matching M4 feed ramps. Heavy duty M16 bolt carrier group and charging handle incuded. Comfortable 15″ free floating flat dark earth M-Lok hand guard. The gas system is pistol length with a low-profile micro gas block allowing the trouble free use of all sub-sonic, super-sonic and whisper ammo. This high quality upper is a perfect fit on any 5.56 or multi-cal AR-15 lower. Swap the complete upper and you’re ready to shoot! Comes with the Barrier Defense lifetime warranty! ****Know your states laws when purchasing gun parts.****