Features and Specifications:Manufacturer Number: MI-SLH12.625Length: 12.625" overallDiameter: 1.5” Outside, 1.3” InsideWeight: 10.3 oz.Material (Rail): 6061 AluminumMaterial (Barrel Nut): 4140 Heat TreatedMaterial (Torque Plate): 4140 Heat TreatedFinish: Type 3 Hard Coat AnodizedMIL-STD 1913 Picatinny Top railTwo Integral Anti-Rotation QD Sling SocketsThree Sides of M-Lok5-Slot Polymer M-Lok railFully Dehorned and DeburredMade in USAIncludes:Barrel Nut, Torque Plate, and WrenchNotes:- Midwest Industries Lifetime Warranty- Titanium Barrel Nut and Titanium Clamp Screws NOT Included, but are available from Midwest Industries.- May not fit all BILLET uppers. (Will fit MI Billet Upper)- Will fit most FORGED uppers.- Not for use on gas piston ARs.