509® Accessories

FN 509® Accessories & Upgrades Overview

FN 509® accessories and upgrades at FN Specialties include Apex Tactical triggers, threaded barrels, optics and sights, striker and extractor upgrades, lights, and slide maintenance solutions. Compatible with FN 509®, 509® Midsize, and 509® Compact—including MRD and Tactical—these enhancements improve reliability, accuracy, and performance.

FN 509® Trigger Upgrade

The factory hinged trigger on the FN 509® can feel longer than it is. The Apex Tactical Trigger for FN 509® replaces the trigger, trigger bar, and sear, using a bladed safety design to reduce perceived travel with a cleaner break and crisp reset. Offered in black, FDE, and red, with flat or curved profiles, it’s compatible across all models, including the LS Edge and CC Edge.

FN 509® Optics & Sights

Red dots and night sights provide faster target acquisition and better low-light performance. A versatile performer is the Holosun 507C X2 (multiple reticles, solar backup, Shake Awake). For duty-grade durability, the Trijicon RMR® Type 2 remains a gold standard—see options in our Optics, Lights & Lasers collection. For irons, Trijicon Bright & Tough Night Sights for FN 509 deliver excellent low-light visibility.

FN 509® Threaded Barrels

Threaded barrels enable suppressor or compensator use and can improve consistency. Apex Tactical manufactures drop-in options:

• 4" Threaded Barrel — For Standard and Midsize; performance-focused feed ramp.
• 3.7" Threaded Barrel — For 509® Compact; tuned for smooth suppressed or compensated operation.

FN 509® Striker & Extractor Upgrades

Improve durability and extraction with Apex components built for high round counts. The Durable Striker is machined from stainless and heat-treated for longevity, while the Failure-Resistant Extractor uses EDM-cut geometry for consistent, reliable extraction.

FN 509® Lights

Weapon lights enhance target identification and control. Browse compact 500–1000-lumen lights and light/laser combos compatible with common holsters in our Optics, Lights & Lasers collection.

FN 509® Slide Maintenance

Stay range-ready with the Apex Slide Maintenance Kit. The kit includes drop-in striker, striker return, striker block, extractor springs, and extractor pivot pin—rated for extended service life and compatible with all current FN 509® models.

Upgrade Your FN 509® with FN Specialties

FN 509® upgrades and accessories from FN Specialties are curated for reliability, accuracy, and better shooting feel. Explore triggers, barrels, optics, sights, lights, and maintenance solutions to give your FN 509® a premium, performance-focused setup.