Accu-Tac Sling Stud Rail Adapter, Anodized Finish, Black Color, Allows Accu-Tac Bipod to mount to Sling Stud SSRA-200 The Accu-Tac Sling Stud Rail Adapter is designed specifically for its bipod line. The adapter allows you to use your sling stud to mount your Accu-Tac bipod. It is CNC machined" and coated with mil-spec hard anodize. Each rail also includes the necessary hardware for installation.