This streamlined, light modular stock with folding adapter is easy to mount on your Century Arms C39 pistol. It offers a sleek, slim design with a padded buffer tube for cheek weld comfort and a molded rubber butt pad for additional recoil absorption and a sling loop. End to end, stock and adapter measures about 8.5". Adapter has been machined to cradle the rear of the receiver from moving side to side and offers easy mounting using the OEM sling hole. We provide the button head bolt and nut, Allen wrench, and folding rear stock. Please call with any questions.***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