Patent ID: 8141289

Claim:
A top opening, modular top rail, multi-rifle adaptable free float rail accessory system (RAS) for use with a firearm having a receiver, a barrel, and a barrel nut which secures the barrel to the receiver, the RAS comprising: a top portion having longitudinally extending lower, edges with a plurality of recesses spaced apart along said edges; a bottom portion having a rearward end machined to receive a bottom part of the barrel nut, a forward face with receptacles formed therein, and longitudinally extending upper edges, each edge having a groove with longitudinally spaced openings therein; a plurality of pins received in said openings and oriented to removably engage with said plurality of recesses located on said top portion when the top portion is mounted to the bottom portion, said top portion being translatable in one of a forward direction or rearward direction relative to the bottom portion to position the pins within said recesses to mount the top portion to the bottom portion; a clamp assembly having a top piece with a center portion having an inner surface configured to receive a top part of the barrel nut and an outer portion configured to secure the clamp assembly to the rearward end of the said bottom portion; and a plurality of screws configured to removably secure said top portion to said bottom portion, said screws being received within said receptacles in the forward face and extending in a direction parallel with a longitudinal axis of said bottom portion, said screws having heads configured to enable said screws to be threadedly secured to the bottom portion manually by a user without the aid of tools.