Ergonomic, lightweight modular rail system offers plenty of M-LOK attachment points along the entire length. Single piece assembly is machined from a semi-billet extrusion of aircraft grade aluminum for enhanced strength and performance to weight ratio. Free floating handguard attaches via long barrel nut machined from aircraft grade aluminum with a hardcoat anodized surface. Handguard fits tightly on the barrel nut and clamps securely by two cross bolt. M-LOK technology allows shooter to place accessory rails anywhere along the length of the rail in 45Adeg intervals. Handguard has two standard, non-rotating QD slots on either side. Please note that a gas block is no longer included Mfg: Geissele Automatics SPECS: Aluminum, hardcoat anodized, matte black. 2.2" (cm) high, 1.25" (cm) I.D., 1.97 (cm) O.D.