If you shoot a lot, sooner or later you will have a problem with a stock firing pin. Precision strikers improve performance and service life; a billet stainless steel striker with a self-lubricating coating resists wear and corrosion, hit after hit. Precision stainless steel striker (firing pin) for Glock 9mm and .40 S&W models (excuding G43/43X/G48) Tighter tolerances than factory Low-temperature vacuum PVD (Physical Vapor Deposition) coating creates a durable barrier against wear and tear CNC-machined from solid 17-4 PH stainless steel billet Individually hand inspected for accuracy No gunsmith required Limited lifetime warranty