The combat m-lok handguard is constructed of 6061 aluminum with a continuous 1913 picatinny top rail, two integral anti-rotation qd sling sockets and seven sides of m-lok.It also utilizes a 4140 heat treated barrel nut, 4140 heat treated torque plate, and is fully dehorned and deburred.The handguard includes a barrel nut, wrench and 5-slot polymer m-lok rail.Made in usa.Rails: Picatinny/M-LOKFirearm Model: AR-15Material: Aluminum/PolymerFinish: Black Hardcoat AnodizedFeatures: M-LOKSwivel Studs: Quick Detach