Own the AR-V AR15 handguard at a fraction of the cost of an MP5! American sourced 6061 T-6 extruded aluminum. Overall width of 1.42 inches and a lightweight of 12 oz. I.D at muzzle end is 1.3 inches. Ergonomic slope design for ultimate comfort. Will work with direct impingement gas systems. Designed for blow-back pistol caliber applications. Every AR-V AR15 handguard comes with a pre-heat treated, 2 inch long 4140 steel barrel nut. This ensures rigid, rock-solid accessory mounting. The barrel nut has been nitrided, not phosphated. Mounting instructions and hardware are included. Hard Coat Black anodizing is in accordance with MILA-A-8625 Type III Class II specifications.