Hard coat anodized, black per MIL-A-8625 TYPE III Class 2.KeyMod also allows for modularity between various manufacturer’s accessories. The KeyMod system breaks from the traditional fixed quad rail setup and allows the operator to decide where accessories or rails are mounted. VLTOR is now introducing the VIS-KM, with the integrated KeyMod system. Place the backer nut of the accessory in the larger hole of the KeyMod slot, then slide it forward into the narrow section of the slot.One of VLTOR’s most innovative products is the Versatile Interface Structure (VIS) upper receiver assembly. Many accessories will have an arrow to remind you of the correct orientation. This protrusion should face in the same direction as the muzzle of the gun. The backer nut, which is the piece that actually can go into the KeyMod slot, protrudes on one side only at the bottom. It is composed of two parts, they are the KeyMod slot and the KeyMod nut. The KeyMod is a modular system with the mounting slots having a key-hole profile. This allows for picatinny rails to be mounted onto the handguard wherever needed too. Instead of having a hand guard with a picatinny rail attached, the KeyMod was designed differernt so that accessories could be mounted directly onto the rail. It has an open-source design, meaning the design can be used freely by any company to make rails or accessories. They alreayd released the KeyMod system to the public in 2012 in hopes of standardizing universal attachment systems. The KeyMod handguard become as a collaboration between VLTOR Weapon Systems and Noveske Rifleworks. This means a smoother surface and more mounting options. They are based on a slot system rather than the rail system of the Picatinny and Weaver mounts. These shortfalls brought the next generation of accessory mounting: KeyMod and M-LOK. And although both the Picatinny and Weaver rail systems work great for mounting scopes, their shortcomings in accessory attachments left a lane open for improvement. Adding a Picatinny rail onto a rifle’s handguard or fore-end adds extra weight, and some shooters complain about the extra bulk and “cheese grate” feeling it has on the hand. For years, the Picatinny rail was the leader in attaching lights, lasers, foregrips, and other accessories, but it had drawbacks.

Vltor keymod accessories