This slide maintenance kit provides the replacement spring set required for scheduled upkeep of the FN 509 slide assembly. Designed around a 10,000-round service interval, it restores striker energy, extractor tension, and slide-stop spring force to factory-fresh spec. Prevents light-strikes, erratic extraction, or slide-lock failures caused by fatigued springs—common issues in high-round-count duty or competition guns.
Compatibility
- FN 509 (full-size)
- FN 509 Compact
- FN 509 Tactical
- FN 509 Midsize
- FN 509 LS Edge (noted: LS Edge uses a different recoil spring assembly; slide springs remain compatible)
Key Features
- Includes striker spring, extractor spring, slide-stop lever spring, and sear spring (where applicable)
- Rated for 10,000-round service life per spring set
- Direct drop-in replacement—no fitting, stoning, or armorer-level modification required
- Factory-spec spring rates maintain OEM trigger weight and reset feel
- Packaged as a complete set for one full slide overhaul
Install Difficulty
2 out of 5 — Basic field-strip and punch work. Tools needed: non-marring punch (1/16″ recommended), small hammer or mallet, slave pin for striker assembly (optional but helpful). Estimated time: 15–25 minutes. Armorer-level certification not required; mechanical familiarity with FN 509 disassembly sufficient.
FAQ
Will this kit change the trigger pull weight?
No. The kit restores OEM spring rates. It does not lighten or alter trigger pull weight. Use the Apex FN 509 trigger kit if a reduced pull weight is desired.
Can I reuse the old springs after 10,000 rounds?
Not recommended. Striker and extractor springs lose tension over time, increasing failure probability. This kit is designed to replace all slide springs at the same interval for consistent reliability.
Does this include the recoil spring assembly?
No. The slide maintenance kit covers the internal slide springs only (striker, extractor, slide-stop lever). The recoil spring is a separate wear item and should be replaced per the manufacturer’s schedule.
Shipping: Ships same business day if ordered before 2 PM EST. Warranty: All components carry a 1-year defect-in-materials guarantee. Springs are wear items; no warranty against fatigue from normal use beyond the rated service interval.
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