The Vism M-LOK Medium Accessory Rail mounts onto M-LOK Spec. handguards. The medium rail covers 2 1/2 M-LOK slots and mounts with three screws and M-LOK compatible T-Nuts. It offers a 9 slot Picatinny rail and the rounded profile ends offer a more comfortable hold when used a hand stop. This accessory rail is perfect for mounting accessories with Weaver/Picatinny mounts such as flashlights and lasers to your M-LOK handguards. It has a black anodized aluminum construction.