A new rail system for your rifle is slowly catching on. Officially announced to the public in July 2012, the KeyMod mounting system uses old principles to lock down rails and accessories. In collaboration between then General Manager of VLTOR Weapons Systems, Eric Kincel and Noveske Rifleworks, Noveske developed the KeyMod handguard. Noveske’s NSR handguard was first to adopt the new system. The lightweight and thin handguard uses a series of keyholes to mount accessories and rails. Kincel mentioned it was not originally intended to replace the 1913 rail, but some speculate it will.
It works the same way as a lot of shelving and scaffolding. One end of the “keyhole” is bigger, while the other end is smaller. You put your accessory or rail into the larger part of the keyhole and slide it down to the smaller end. With a few quick turns of a screwdriver, secure the rail or accessory down and you are good to go. Installation is quick and easy. You never have to adjust anything on the underside of the handguard. The complete system is sleeker and more slim-lined than traditional mounting systems.
Kincel’s goal in “developing” the system was to have it become an industry standard. Therefore, he made the schematics an open source, so any manufacturer could create its own mounts, rails and accessories that work with the KeyMod handguard.
The KeyMod handguard has a 1913 rail along the top of it already, however, you can purchase additional KeyMod rails to add to the side or bottom of the KeyMod handguard. The strong attachment of the KeyMod accessories to the KeyMod handguard are unaffected by recoil and optics have an excellent return to zero capability when detached and reattached.
Rifles with this handguard and rail system are being produced by CMMG, Knight’s Armament, Primary Weapons Systems, Bravo Company, Spikes Tactical and of course Noveske—to name a few. Strike Industries have made them for the AK-47 and Mark Krebs of Krebs Custom Guns has made a KeyMod system for Saiga rifles, with more rifles expected soon.
New rail systems don’t just spring out every year and start a new industry standard. Weaver rails were all we had until 1994 when the Picatinny Arsenal—a military research and manufacturing facility— developed the Picatinny system. The Picatinny rail is now an industry standard on all semi-automatic, tactical-style, military rifles and some handguns.
Both Picatinny and Weaver rails incorporate a system of raised ridges with spacing slots in between. To mount an accessory to either, you slide the optic, grip, bipod or other gear onto the rail and then secure it using tools.
The 1913 rail has strict dimensions. The locking slot on the Picatinny rail is 0.206-inches wide and the spacing of slot centers measures 0.394 inches. In contrast, the Weaver rail’s locking slots measure 0.180-inches and have no consistent measurement in the slot center spacing. Therefore, Weaver mounted accessories will fit Picatinny rails, but Picatinny mount accessories will not fit always fit Weaver rails.
Needless to say, it took a very long time for the industry to switch from Weaver to Picatinny. We will have to wait and see if the KeyMod mounting system catches on. Currently, there are not many accessory offerings that fit the KeyMod system. Perhaps on the rifle we purchase to celebrate our retirement. Only time will tell.