wipboten M-Lok Rail Section Polymer 5,7,9,11 Slot Polymer Picatinny/Weaver Rail Rails come in L2 Size (5 Slots)L3 Size (7 Slots) L4 Size (9 Slots) L5 Size (11 Slots) 4pcs set Designed for use with all M-LOK compatible hand-guards and For-ends The M-LOK Polymer Rail Sections allow the attachment of various 1913 Picatinny spec rail-mounted accessories Available in four lengths, so you can position just enough rail area exactly where you need it for each accessory