The Apex Durable Striker for FN 509/503 Series pistols is a premium drop-in replacement engineered for exceptional durability. Certified for 125 000 dry fire strikes on an empty chamber this striker represents over 3 years of R&D and more than 1 million documented dry fires during testing.Apex Durable Striker for FN 509/503 SeriesCertified for 125 000 dry fire strikesDirect drop-in replacement for factory strikerIncludes Durable Striker BufferIncludes Buffer Removal ToolOver 3 years of continued R&D and testingPerfect for competitive shooters training enthusiasts and anyone who relies on extensive dry fire practice. This complete kit provides everything needed for installation and long-term reliable performance.