Armalite's UM15TAC14 M15 Tactical Upper Assembly is perfect for an AR setup intended for duty and defense applications. It comes standard with an adjustable gas block for optimal performance while using a wide array of ammunition. This upper assembly also features a sturdy 10 inch hand guard with multiple M-LOK attachment points for the installation of tactical lights, lasers, and other accessories, and a full length picatinny rail allows an optic of choice to be mounted. In addition, the M15 Tactical Upper Assembly is outfitted with a pinned and welded dual purpose, flash hiding compensator to reduce muzzle rise and recoil, and brings the barrel length to 16 inches - meaning no NFA paperwork is required. Armalite M15 Tactical 5.56 NATO Upper Assy 14.5"