Shop › B5 RAIL COVER M-LOK CB B5 RAIL COVER M-LOK CB $17.10 B5 Systems Rail Covers, 4 Pack, Fits M-LOK Rails, Matte, Coyote Brown RCM-1258 Quantity: Add To Cart Added! B5 Systems Rail Covers, 4 Pack, Fits M-LOK Rails, Matte, Coyote Brown RCM-1258