SLR 15.5 inch ION Hybrid M-LOK 5.56 Handguard Black ION15.5ML-HYB. 35 inch Internal Diameter. Mil-Spec Hardcoat Anodize. 7075 Barrel nut w/Hardcoat Anodize. Free Floating Design. 4 QD swivel sockets. 7-sided handguard design. MLOK at 3 6 9 o'clock and...