AK 47 STANDARD FLAT MOUNT REAR STOCK ADAPTER. Our new AR stock adapter makes it easy to add a two bolt style (ACE) stock, Choate stock or our modular, custom billet, Galil, rear stock to your AK47 pistol using our thin adapter between the grip and the receiver. Two threaded holes have 10/32 threads. **This adapter does NOT fit M92/M85, Draco, C39 or Arsenal Pistols. Please visit those specific sections on our web site.