Beware, not piston compatible. - FAB Defense Aluminum Black Quad Rail - 6"/8"/11.5" Long

Solid construction. Good drop in hand guard. Secures with two sets of hex-headed screws of different sizes. If you over torque them, expect the heads to strip if you try to remove them. This happened to me after I discovered the hand guard was not piston compatible. Had to drill out the screw holes and pry the hand guard off, effectively ruining the hand guard. Overall a functional hand guard. Just know what you're getting.