Patent ID: 7131367
Filing Date: 2006-11-07
Classification: F41A

Abstract:
1. A hydraulic bolt buffer assembly for a firearm, said firearm including a receiver having a longitudinal chamber, a bolt and carrier assembly mounted in said chamber for reciprocating movement between a recoil position and a battery position, a spring for urging the buffer into contact with the bolt and carrier assembly for movement therewith and for biasing said bolt and carrier assembly toward the battery position, said buffer assembly comprising: a housing having an inner cavity; a piston disposed within the inner cavity of said housing and movable between an extended position and a depressed position, said piston being in contact with said bolt and carrier assembly; a spring for biasing said piston in said extended position; and a stationary bearing member in fixed relation in said housing, said bearing member including means for providing a fluid-tight seal with said inner cavity and further retaining an accumulator in stationary relation along a primary axis of said buffer assembly wherein movement of said piston from the extended position to the depressed position causes hydraulic fluid contained in a first fluid chamber of said inner cavity to be moved to a second fluid chamber of said cavity containing said stationary accumulator and in which movement of said fluid into said second fluid chamber compresses said accumulator as said piston is moved to said depressed position.