Hera USA Fits AR-15, Handguard, 7, Aluminum, Black 11.05.01 Hera USA's AR-15 M4 IRS 7" Handguard is a free floating quad-rail design made from high-quality aluminum" and is built to handle the hardest use and abuse of tactical and competitive shooting. It is CNC milled from aluminum alloy and hard coated anodized for added durability. It comes with its own barrel nut where the handguard is clamp mounted with 3 screws for additional strength. It features anti-cant tabs to prevent the rail from turning even under severe conditions.