Designed for use with all M-LOK compatible Hand Guards and Forends, M-LOK Aluminum Rail Sections allow the attachment of various 1913 Picatinny spec rail-mounted accessories such as lights, vertical grips, etc. Machined from milspec-anodized aluminum, M-LOK Rail Sections also feature beveled ends to reduce snagging and eliminate sharp corners and edges. All hardware necessary for attachment directly to M-LOK Slots on either aluminum or polymer hand guards and forends is included. 3 Slots, max overall length of 1.6" 5 Slots, max overall length of 2.5" 7 Slots, max overall length of 3.3" 9 Slots, max overall length of 4.1"*M-LOK accessories will not fit into the MOE slots without modification. MOE accessories, however, will work on an M-LOK slot with a small adapter plate.*