The Vism M-LOK Accessory Rail mounts onto M-LOK Spec. handguards. It is a 5 slot Picatinny rail that covers 1 1/2 M-LOK slots. It mounts with two scres and M-LOK compatible T-Nuts. The rounded profile rail ends for a more comfortable hold when used as a hand stop. It is perfect for mounting accessories with weaver/Picatinny mounts such as flashlights and lasers to your M-LOK handguards. This accessory rail features a black anodized aluminum construction. This product ships in approximately 1 days