The Caldwell Picatinny Rail Adapter utilizes both the shoulder sling and Picatinny Rail Mounted Accessory. The user can change the vertical angle of the Pic Rail Adapter to align with the barrel instead of the stock by adjusting the tension of the front and rear T20 screws. Rear facing sling swivel stud allows user to attach sling Integrated picatinny rail for attaching bipods or other accessories Multi-piece design creates a secure fit that won't come loose Machined aluminum construction with a molded rubber pad Mfg: Caldwell Shooting Supplies