Two-piece, four-rail handguard installs easily and gives flattop receivers a continuous 12 o'clock rail. Clamps directly to standard barrel nut. Machined aluminum construction combines strength with light weight. Free floats the barrel. Available for Mid-Length and Rifle gas systems. Mfg: Centurion Arms SPECS: 6061 T6 aluminum, hardcoat anodized, matte black. 2.1" (5.3cm) wide. 2.38" (6cm) high. 1.37" (3.4cm) inner dia. Does not have T-Marks. Includes mounting hardware and instructions.