Specifications and Features:Midwest Industries AR-15 Hand guard MI-CRT12.625AR-15 Combat Rail T-Series12.625" One Piece Free Float Hand Guard4140 Heat Treated Barrel NutFeatures Patented 4140 Heat Treated Torque PlateProvides continuous monolithic look with full length upper railTwo Integral Anti-Rotation QD Sling SocketsHigh Quality MIL-STD 1913 Picatinny rails, T-marked for accessory locationFully Dehorned and Deburred100% Made in USAMI Lifetime Warranty2.43" Tall2.15" Wide1.3" Inside DiameterOverall Length 12.625"Installed Weight 14.6 oz6061 AluminumType 3 Hard Coat AnodizedMatte BlackIncludes:Barrel Nut and Wrench IncludedFits:Mil-Spec Forged AR-15 Upper ReceiversNote: Due to many different dimensions Billet Upper receiver compatibility is unknown.NOT for use on Gas Piston AR's