FEATURES-15" Rail-Features M-LOK® compatible mounting system-Free float handguard eliminates loads from barrel reducing the deflection for more accurate shooting-Precision Machined 6061-T6 Aluminum Alloy for high strength & lightweight-Proprietary engineered profile offers additional cross sectional strength-Steel barrel nut to resist movement under heat-Hard coat anodized -Handguard alone weighs 6.6oz-Includes BCM® M-LOK® compatible sling mount-1.3" Inside diamter-1.5" wide