Our AR stock adapter paired up with the ATF approved Shockwave Tube and Blade Stabilizer, and our upgraded folding adapter(LEFT SIDE FOLD) Easy to install on your AK47 Century Arms C39 pistol using our adapter attaching to the rear of your receiver through the sling hole. **Complete kit includes the Rear Adapter, upgraded folding adapter, KAK pistol buffer tube, castle nut, and Shockwave Blade. Upgraded folding adapter offers upgraded machined parts, machined improved locking buffer tube slot to prevent turning, upgraded hinge spring, improved locking hinge, slimmer design and harder coating. **Ambidextrous Buffer tube sling loop sold separately.*PLEASE TELL US IN THE COMMENTS SECTION IF YOU HAVE A NEWER V2 or RAS 47 MODEL, OR WE WILL SHIP YOU THE STANDARD C39 ADAPTER WITH THIS SET UP