These Knights Armament Ribbed Rail Panels have been used globally on M4 Carbines, and Military M4 Carbines. They are made from lightweight polymer, offer an enhanced grip, and help insulate your hand from barrel heat.
The Knights Armament Company (KAC) rail cover set is most commonly used on quad rails. This particular set is perfect for the rifle length rails. These rails are compatible with most 1913 Picatinny rails.