Eliminate irregular rim indentation due to a blunt or improper firing pin. The KIDD Firing Pin made from a wire EDM machine replaces the tool and die process of stamping out the factory firing pin. This difference in production results is a much higher quality part for your rifle. FEATURES: Upgrade accessory for the 10/22 bolt Achieve consistent ignition Positive rim indentation Properly hardened steel Precision ground and wire EDM cut holding 0.0001" tolerance Installation Note: This compression spring is directional in nature due to one end being conical. When installing the spring be sure to keep the larger end of Mfg: Kidd Innovative Design