Patent ID: 7941959
Filing Date: 2011-05-17
Classification: F41C,F41G

Abstract:
1. A modular integrated rail system for a firearm, said firearm comprising an upper receiver, said upper receiver comprising a dovetail rail extending longitudinally between a forward end and a rearward end thereof, said upper receiver still further comprising a barrel receiving receptacle at said forward end thereof, said firearm further comprising a barrel received in said barrel receiving receptacle and a barrel nut received around said barrel receiving receptacle to retain said barrel within said barrel receiving receptacle, said barrel nut comprising a cylindrical outer surface, said modular integrated rail system comprising: an upper hand guard having a dovetail rail extending longitudinally between a forward end and the rearward end thereof; a clamp removably secured to said rearward end of said upper hand guard, said rearward end of said upper hand guard and said clamp each comprising a clamping surface configured and arranged to cooperatively engage said cylindrical outer surface of said barrel nut and thereby support said upper hand guard on said barrel nut without engaging said firearm forward of said barrel nut; and alignment tabs extending from said rearward end of said upper hand guard, said alignment tabs being configured and arranged to engage said upper receiver of said firearm whereby said alignment tabs provide rotational alignment of said hand guard to the upper receiver, said upper hand guard extending from said forward end of said upper receiver forwardly above said barrel with said dovetail rail of said upper hand guard in linear alignment with said dovetail rail of said upper receiver.