Complete AR-15 16″ 300 Blackout Stainless Steel Upper with 15″ Air Lite M-Lok Free Float Hand Guard Includes A3 upper receiver with forward assist and ejection port cover installed. The barrel and receiver have matching M4 feed ramps. The stainless steel barrel comes tipped with an indexed A2 flash hider and has a 1:8 twist. Heavy duty M16 bolt carrier group (BCG) and charging handle included. Super strong 15″ light tactical free floating M-Lok hand guard over a low profile micro gas block. The gas system is pistol length allowing the trouble free cycling 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. Comes with the Barrier Defense lifetime warranty! ****Know your states laws when purchasing gun parts.****