This folding mechanism can be used with any type of mount that utilizes a two threaded mount and stock adapter that uses two holes(thread 10-32). A Choate stock, ACE type stock, or our modular, custom billet rear stock. It locks when opened and extended and has a threaded sling loop hole on one side. May fold to the left or the right. Locks in the open position and closed. Anodized, black finish.