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Once slid into position, lugs are tightened (there may be one or several, depending on the accessory) to lock down the accessory bracket, securing it to prevent wobble during recoil or rough handling. Basically a lug is inserted into a large opening and then slides along a narrower track to lock in place. These keyholes resemble the sliding chain locks once common on the back of hotel doors. KeyMod uses a series of “keyholes” used to lock accessories into place. Because the system is open sourced, it encourages more manufacturers to integrate the KeyMod system into their hand guards and accessories. This system is “open sourced,” meaning any company can manufacture products using the KeyMod design without paying royalties to the developers. Let’s take a closer look at these two rival mounting systems.įirst created by VLTOR Weapon Systems, KeyMod was released through Noveske Rifleworks, in 2012. The openings, or “negative space,” reduce weight and eliminate the rough, cheese grater texture of a traditional Pic rail.Īlthough these two systems offer many the same benefits, they differ slightly in design. Compatible accessories can be mounted to a bracket that locks into those openings. In other words, M-Lok and KeyMod both have integrated openings machined directly into the hand guard. Both systems allow you to attach accessories directly to your hand guard, eliminating the need for a rough and hefty extra rail.īoth the KeyMod and M-Lok systems support direct attachment of optics, lasers, flashlights, bipods, and other accessories to a negative space mounting point. The KeyMod and M-Lok systems entered the scene in valiant attempts to alleviate this problem. Picatinny rails can be bulky and heavy, adding unwanted weight and throwing off the balance of your weapon. Now, two young contenders seek to dethrone what was once the gold standard for attaching firearms accessories. For decades, the Picatinny rail has been the reigning king of mounting platforms. There is currently a head-to-head showdown taking place in the firearms world.