Complete AR-15 16″ 6.8 SPC Upper with 15″ Slim, Lightweight M-Lok Hand Guard Shoots both SPC and the hotter SPC II ammo no problem! Upper includes a 16″ M4 contour chrome moly non-chrome lined barrel with 1:10 twist and tipped with an A2 flash hider/suppressor. Carbine gas system with a low-profile micro gas block. A3 billet 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 included. 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.****