A folding stock assembly for firearms such as rifles and shotguns. The stock is made of metal rod that has been bent to form laterally spaced left and right elongated arm members that have rear ends connected to the top end of a U-shaped shoulder rest portion. The front end of the respective elongated arm members are pivotally connected to the rear end of a neck portion extending rearwardly from the upper end of the handgrip. There is structure in the interior of the end cap for locking the elongated arm members in either its static storage position or its rearward functional deployed position.