This combination of our rear stock adapter and upgraded folding tactical padded buffer tube is easy to install. Our new patent pending AR stock adapter makes it easy to attach this set up to your Century Arms C39 AK pistol to the rear of your receiver through the sling hole. All of the parts are finished in jet black anodize. Upgraded folding adapter offers upgraded machined parts, upgraded hinge spring, & slimmer design. (gun & other parts sold separately)***PLEASE TELL US IN THE COMMENTS SECTION IF YOU HAVE A NEWER V2 or RAS47 MODEL, OR WE WILL SHIP YOU THE STANDARD C39 ADAPTER WITH THIS SET UP