The larger diameter shoe is then dropped into the larger hole section of the KeyMod handguard and pushed forward. Attaching an accessory to a KeyMod rail is as follows: The accessory or rail strip possesses a specialized keyed nut and a larger diameter shoe that is loosely attached to the rail or attachment. You aren’t stuck with a large amount of space unused thus saving weight and improving ergonomics of the handguard. The biggest advantage to this system is that you only add rails or accessories on where you want them. Picatinny rail strips can be added to a KeyMod rail to facilitate the use of Picatinny accessories that still dominate the market. KeyMod bases itself on the concept of “Negative Space” mounting where accessories are directly mounted to handguard verses relying on an intermediary interface like the rail slots like on Picatinny. Its name derives from it’s key shaped mounting holes and a reference to it’s modularity. Originally developed to replace the mil-spec Picatinny rail, it was invented by none other than Noveske who specialize in high end AR systems. This method is common on pistol accessories. Another method is the accessory is slid on from the front of the rail and then locked down once you have it where you want it. The accessory stays in place by the center cross bolt locking into the slot and the clamp keeping it tight. Attaching accessories to a Picatinny rail is as easy as either clamping the add-on to an available slot where you want it and tightening the cross bolt via the thumbscrew, bolt, or QD lever. Extremely recognizable by it’s distinct horizontal slots precisely spaced to spec across the mountable portions of the handguard – 0.180 in or 4.57mm to be exact. It has the largest users of any other mounting platform still to this day and for good reason – it’s simple, widely universal, and extremely versatile in the positioning of mounted accessories. It has a received a NATO designation of MIL-STD-1913 and is the go to mil-spec process of attaching accessories to a firearm. An evolution of the Weaver system and adopted my various militaries across the globe, Picatinny rails are effective and easy to utilize.
The most familiar and longest running platform of them all.
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