The Midwest Industries Combat Rail T-Series Free Float Quad Rail Handguard features a patented 4140 heat treated torque plate with 6061 aluminum type 3 hard coat anodizing. It includes a continuous mil-std 1913 picatinny top rail, T-marked for accessory location with two integral anti-rotation QD sling sockets. the handguard is fully dehorned and deburred and comes with a barrel nut and wrench. Features4140 Heat Treated Barrel NutBarrel Nut and Wrench IncludedFeatures Patented 4140 Heat Treated Torque Plate6061 Aluminum Type 3 Hard Coat AnodizedHigh Quality MIL-STD 1913 Picatinny rails, T-marked for accessory locationProvides continuous monolithic look with full length upper railTwo Integral Anti-Rotation QD Sling SocketsFully Dehorned and Deburred100% Made in USA- Keeps America WorkingMI Lifetime Warranty