Gun stock recoil mechanism

Abstract From the Canadian patent

A comb and recoil assembly for a shoulder firearm the firearm having, a stock with a butt end and a barrel end includes a cheek piece which is connected to the upper surface of the stock. The cheek piece is movable between an extended position and a retracted position. A recoil mechanism is located in the interior of the stock and has a moving member which moves relative to the stock in response to the recoil of the firearm upon firing. The moving member and the cheek piece are connected by a cam and cam follower arrangement to substantially maintain the cheek piece in the extended position when the moving member is at rest and to permit the cheek piece to move to the retracted position …