Free floating barrel design. Uninterrupted upper rail platform. Integrated sling swivel attachment points with limited rotation. Aircraft grade aluminum. Hardened steel barrel nut. Grade 8 Military specification fasteners. Mil-Spec 1913 Picatinny rails. Oval shape to feel like traditional hand guards. Military Specification Type III Hard Coat Anodized. Bolt Up System Barrel Nut Wrench is required for installation.