The Magpul M-LOK Polymer Rail Section 9 Slot is designed for use with M-LOK compatible Hand Guards and Forends. The Rail Section will allow the attachment of 1913 Picatinny rail mounted accessories such as lights, vertical grips, etc. Injection molded from reinforced composite polymer that is lightweight, yet strong and durable. The M-LOK Rail Sections also feature beveled ends to reduce snagging and eliminate sharp corners and edges found on some rails. All hardware for attachment directly to M-LOK Slots on either aluminum or polymer hand guards and forends is included. 9 Slots, max overall length of 4.1". Made in U.S.A.