MIDWEST INDUSTRIES COMBAT RAIL HD M-LOK HANDGUARDS FOR AR-15 FEATURES Shape and profile are designed for maximum rigidity and extreme use Minimal point of impact shift for NV aiming devices Longer 4140 Barrel nut to provide stability of the handguard Machined heavy duty anti-rotation tabs Uses the MI patented torque plate to provide no forward movement of handguard Two steel anti-rotation QD sockets for maximum strength and placed to minimize gun roll Body constructed of 6061 Hardcoat anodized aluminum Fully Dehorned and Deburred 5-Slot polymer M-LOK Rail included Seven Sides of M-LOK Outside Diameter: 1.75 Mfg: Midwest Industries