Designed for use with all M-LOK compatible handguards and forends, M-LOK aluminum rail sections allow the attachment of various 1913 Picatinny spec rail-mounted accessories such as lights, vertical grips, etc. Kit contains: 1 CMC M-LOK QD Sling Mount. 1-CMC M-LOK 3 Slot Picatinny Rail. 3 Slot L:1.25". W:0.75". H:0.50" Weight: 2.0 oz. 1-CMC M-LOK 5 Slot Picatinny Rail. 5 Slot L:2.50". W:0.75". H:0.50". Weight:4.0 oz. 1-CMC M-LOK 7 Slot Picatinny Rail. 7 Slot L: 3.0625" W:0.75". H:0.50". Weight 6.0 oz. QD Sling Mount accepts any push-button QD swivel. QD Mount L:1.50" W: 0.3125". H:0.50". Weight: 2.0 oz. Beveled edges reduce snagging.