Complete AR-15 16″ 300 Blackout Upper with 12″ Free Float Quad Rail This upper includes a 16″ barrel tipped with an indexed A2 flash hider/suppressor. The A3 upper receiver comes with with forward assist and ejection port cover installed. The barrel and receiver have matching M4 feed ramps. Heavy duty M16 bolt carrier group and charging handle included. Comfortable 12″ free floating quad rail hand guard for a total of 54″ of utility. The gas system is in preferred pistol length (with a low profile micro gas block) allowing for flawless cycling with all 300 Blackout ammo (subsonic, supersonic and whisper ammo). This high quality upper is a perfect fit on a 5.56 or multi-cal AR-15 lower. Swap the complete upper assembly, lock it on and you’re ready to shoot! Comes with the Barrier Defense lifetime warranty! ****Know your states laws when purchasing gun parts.****