Tiger Rock AR-15 Assembly Tool for Charging Handle Pin Gas Block Roll Pin. This allows the maintenance or replacement of parts without having to remove the pin or sleeve. The tool easily fits in the palm of your hand and is sized in millimeters to ensure you get the correct pin every time. The stainless steel spring steel roll pin driving tool is made to last a lifetime. This tool is designed to give you a solid base to remove/replace the pin and roll pin with ease. Package Contents: Tiger Rock AR-15 Assembly Tool for Charging Handle Pin and Gas Block Roll Pin Tiger Rock TL006: AR-15 Assembly Tool for Charging Handle Pin Gas Block Roll Pin