TacFire A.C.E. M-Lok Handguard 7" Black Hardcoat Anodized Aluminum For AR-15 Extruded From The highest Grade Of 6061-T6 Aluminum Reinforced With An Impervious Class 2 Type III Black Hard Anodize Per Mil-A-8625 Standards And specifications, Our M-Lok Handguards Are leading The Firearms Industry With Cutting Edge Precision, Along With New Era Innovative designs. Material: 6061-T6 Aluminum Finish: Black Hardcoat Anodized