KeyMod
Keymod is the name given to a universal interface system for firearm accessory components in an effort to establish a system superior to the MIL-STD-1913 accessory rails currently in use. The concept was first created by VLTOR Weapon Systems of Tucson Arizona and released through Noveske Rifleworks of Grants Pass Oregon before being published in the public domain for adoption by the entire firearms accessory industry[1] .
Description
Keymod is an open-source design released for use and distribution in the public domain in an effort to standardize universal attachment systems in the firearm accessories market. The keymod system consists of two parts. The keymod hole, and the keymod nut. The hole is distinctive with a larger diameter through-hole combined with a narrow slot. The slot is chamfered on the backside while the through hole is sized for clearance of a quick-detach sling swivel (approximately 3/8" diameter).
The nut is stepped and the larger diameter end is chamfered around 270 degrees of it's diameter. The angled face created is meant to interface with the chamfer on the backside of the slot in the keymod hole. The full diameter is left intact to create two flats on the nut which align the nut to the slot, and allow it to be indexed to the accessory as well as to the keymod hole. This eliminates the need to align the nuts to the holes prior to accessory installation as well as the need for tools to tighten the screw/nut. In most accessories, the screw is swaged after assembly to ensure that it cannot be backed out of the nut. This prevents loss of small parts (screws, nuts or other small parts used in the assembly of the accessory).
The keymod specifications call out a "recoil lug" on the accessories which is intended to interface with the larger through hole portion and resist slippage of accessories during counter-recoil. The combination of the angled interface of the nut to the keymod hole and the recoil lug to the through hole make for a very strong attachment point which will not slip under harsh recoil or counter recoil. It also provides for an excellent return-to-zero when removed and re-installed.
Uses
The keymod system is intended to be used as a direct attachment method for firearm accessories such as flash light mounts, laser modules, sights, scope mounts, vertical grips, rail panels, hand stops, barricade supports, and many others. The goal is to eliminate the need for the heavy and often non-ergonomic MIL-STD-1913 accessory rails.
History
The beginning of the keymod system occurred during a discussion between Eric Kincel of VLTOR Weapon systems and John Noveske of Noveske Rifleworks. Both were pursing the idea of a universal attachment system for various accessories. VLTOR had previously pursued a design concept which had yet to be launched which bore striking similarity to a system independently developed by Noveske. After a short collaboration, Noveske decided to adopt what became the keymod system for the NSR series of hand guards and accessories [2] .
The specifications for the keymod system was first published the 25th of July, 2012. The current revision was released in October 2012.
Technical Specifications
The specifications for the keymod system were initially released by VLTOR Weapon Systems as an open-source set of drawings. As such, some manufacturers have added their own variations on the system such as using the through-hole portion as a sling-swivel attachment point. The critical interface dimensions, however, still follow the specifications. The latest specifications can be obtained through by contacting VLTOR Weapon Systems.
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Keymod Slot details -
Keymod nut details -
Keymod accessory details -
Keymod nut/screw assembly details
Keymod Manufacturers
The keymod system is currently offered by:
- Noveske Rifleworks
- VLTOR Weapon Systems
- CMMG
- Mega Arms
- Knight's Armament
- Primary Weapon Systems
- Rainier Arms
- Krebs Customs
- Ambush Tactical
References
- ^ Curtis, Rob. "VLTOR gives the keymod tdp to you". Militarytimes.com. Retrieved 4/9/2013.
{{cite web}}: Check date values in:|accessdate=(help) - ^ Chin, Cass. "Noveske NSR Handguard". Military Morons. Retrieved 4/9/2013.
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