The Evolution Gun Works Free Floating AR-10 Handguard is constructed of aircraft grade aluminum alloy and given a hard coat anodized finish for durability. The 2.25" diameter tube is solid and lightweight, with a slight texturing along its exterior for a sure grip in any environment. This two-piece handguard design includes a proprietary barrel nut that must be installed on the host firearm for use. Gunsmith installation is recommended. This handguard is compatible with Armalite AR-10 rifles only.