Abstract: An adjustable stock comprises a frame and a housing that slides telescopingly with respect to the frame between at least two configurations: a shortened configuration and a lengthened configuration. Preferably there is at least one configuration of intermediate length. To permit the adjustment of the stock, a lever arm, biased in a locking position, is pressed, whereupon it unlocks the housing from the frame and allows the user to slide the housing with respect to the frame from one configuration to another. The lever arm has a projection on the end that is either seated in one of several recesses in the housing, thereby locking the frame to the housing, or slidable within a channel formed in the housing and running from one recess to another.