Top opening, modular top rail, multi-rifle adaptable free float rail adaptor system (ARM-R)

Register USPTO Patent
Application Number 12217874
Grant Number 08141289
Status In Force
Filing Date 2008-07-09
First Publication Date 2012-02-23
Publication Date 2012-02-23
Grant Date 2012-03-27
Owner LWRC International, LLC (USA)
  • Gomez, Jesus S.
  • Mellors, Darren


An improved Rail Adaptor System/Rail Accessory System (RAS) which attaches to a firearm. The rail is top opening, modular, and free floats the barrel. Provided is a rigid, lightweight, strong platform for mounting firearm accessories. Heat transmission from the barrel assembly to the user is limited. The user is also protected from ventilated gases originating from the operating system. A quick detachable top rail section is provided so that that gas system may be easily accessed. This removable top section of the rail is what makes this device unique because the RAS may be installed without removing the barrel, gas system, front sight base, flash hider or the barrel nut. The herein described RAS is adaptable to a wide variety of firearms with the use of conversion parts. The top rail “returns to zero” on reinstallation allowing the remounting of various optics and electronic gun sites without the need to realign them.

IPC Classes  ?

  • F41G 1/16 - Adjusting mechanisms therefor; Mountings therefor