The Overwatch Precision Firing Pin reduces the already incredible CZ P10 series trigger break by half a pound through improved striker geometry and the addition of an NP3 coating. Use with your existing OEM striker spring for a reliable, light-strike free 4lb break. Compatible with CZ P10 F/S/C 9mm models only. Will not fit .45 caliber models. Features416SS, Swiss machinedPost production stress relieved for durabilityHeat treated to 45HRCNP3'ed for superior corrosion resistance and lifelong lubricity