the adjustable firearm support of present invention works in combination with a firearm stock having a butt pad bolt or a stock built of sufficient materials to fasten to utilizing a common threaded fastener . this adjustable firearm support includes a support rod , base member , a positioning block , positioning pin and a support leg . the positioning block is pivotably received by the base member for rotating movement between a first retracted position and a second extended position for use . a locking mechanism allows an operator to selectively lock the adjustable firearm support in either the retracted or extended position . in one embodiment of the adjustable support , a base member is adapted to fit the generally upright inside surface of a fire arm stock so configured and employ a unique internally threaded socket bolt to capture and tighten up against a bolt which is carried by the firearm stock .