If your replacing the firing pin on the old style 64 Action such as the CIL 190 or 180, purchasing this along with the smaller firing pin and spring will allow it to be a drop in upgrade.
Note: If you have the early style firing pin, Anschutz have a service kit to service your bolt and it will allow you to retrofit your firing pin to the current style. See item # 100-013805 for the kit
Item Nr.: 100-002832