M-LOK Compatible mounting system; Free Float Handguard eliminates loads from barrel, reducing the deflection for more accurate shooting; Precision Machined Aerospace 6061-T6 Aluminum Alloy, for high strength and lightweight; Proprietary engineered profile offers additional cross sectional strength; Steel Barrel Nut (same KMR, MMR, and QRF series), to resist movement under heat; Hard Coat Anodized per Mil-A-8625F, Type III, Class 2; Includes BCM M-LOK Compatible Sling Mount, (FREE for a limited time)