Midwest Industries CRM HD 308 High Combat Rail AR-10 M-LOK Handguard 13.5in Black. That redefines durability and performance. Engineered for maximum rigidity and extreme use. Specifications for Midwest Industries CRM HD 308 High Combat Rail AR-10 M-LOK Handguard: Manufacturer: Midwest Industries Color: Black Finish: Hard Coat Anodized Fabric/Material: 6061 Aluminum Gun Make: AR Platform Gun Model: AR-10 Gun Type: Rifle Handguard Type: Free-Float Gun Rail: M-LOK Inner Diameter: 1.3 in Outer Diameter: 1.85 in Height: 3.9 in Features of Midwest Industries CRM HD 308 High Combat Rail AR-10 M-LOK Handguard 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 the handguard Two steel anti-rotation QD sockets for maximum strength and placed to minimize gun roll Package Contents: Midwest Industries CRM HD 308 High Combat Rail AR-10 M-LOK Handguard Midwest Industries MI-CRMHD-308H-13.5: AR-10 CRM HD 308 M-LOK High Combat Rail Handguard 13.5in Black