Strike industries strike rail is a lightweight, feature packed rail that you can depend on when entering harm's way.The rail features 1.57" internal diameter for suppressor compatibility, ambidextrous qd socket placement, a built-in anti-rotation, and reinforced steel mounting nut and bolt.The package includes a strike rail handguard, mounting hardware, allen key, barrel nut and wrench and shim kit.Rails: M-LOKType: HandguardFirearm Type: RifleFirearm Model: AR-15Material: AluminumFinish: BlackFeatures: M-LOKFree Floating: Yes