This rail cover set is the lightweight rail cover for King Arms M4 M-LOK® TWS Ver.2 , stylish design offer patented slip-proof textures and hardware in order to add superior grip and heat protection. Included slim long cover, slim short cover, curved long cover, curved medium cover, handstop with cover & handstop.

Will also fit on other M-LOK® system by using M-LOK® T-nut (optional).