KAC-Knight's Armament KeyMod Sight Kit With 300M Rear Sight
Mounts to flat top upper. Flip-up sight stays down out of the way when using optics, yet is easily flipped up. Detents hold sight in up or down position, sight does not lock in position. Windage adjustable.
Includes removable snap in plastic small aperture, part # 97081, remove for large aperture.