Complete AR-15 16″ 6.5 Grendel Upper w/ 15″ Slim M-Lok Hand Guard This built upper includes a 16″ chrome moly non-chrome lined barrel with 1:8 twist and chambered in the desired Grendel II. The barrel comes tipped with A2 flash hider/suppressor threaded 5/8″-24. Carbine gas system with a low profile micro gas block. A3 billet upper receiver with forward assist and ejection port cover installed. Barrel and receiver have matching M4 feed ramps. Charging handle and heavy duty M16 bolt carrier group with proprietary 6.5 Grendel bolt are included. A comfortable 15″ free floating M-Lok hand guard. 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.****