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.This rail 15.5 long with a black finish and is M-LOK compatible.