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), our flat stock mount for the C39, Yugo M92, Draco AK47 and some others. Allows you to mount a Choate stock, ACE type stock, or our modular, custom billet rear stock or Galil stocks. It locks when opened and extended and has a threaded sling loop hole on one side. May fold to the left or the right. Sling loop NOT included. Anodized, black finish.