The sling adapter is designed to work with PRi's Carbon Fiber Forearms.  The sling adapter is attached to the forearm with a screw and black plate.  Swivel is a push button, quick release sling swivel that attaches to the adapter.  Sling swivel adapter is constructed of T6 6061 hard coat black anodized aluminum. Sling swivel with push button release has a 1.00" ID loop. # 10-32 Steel screw with a steel bar nut.  The bottom side radius is made for a 2" tube.