Action Enhancement Kit for FN 509 – with Curved Trigger

Direct drop-in trigger kit for the FN 509. Reduces pull weight to approximately 5.5 lbs, shortens pre-travel, over-travel, and reset distance, and delivers a crisp break. The patent-pending design uses a center-mounted pivoting safety that maintains factory safety values. No fitting required.

Compatibility

• FN 509 (all variants: Compact, Tactical, LS Edge, MRD)
• FN 509c (all versions)
• FN 509 Edge
• FN 509 Tactical
• FN 509 LS Edge

Key Features

• Drop-in design — no gunsmithing or fitting required
• Pull weight: ~5.5 lbs (reduced from factory ~6.5–7.5 lbs)
• Pre-travel, over-travel, and reset distance reduced
• Crisp, defined break with no creep
• Center-mounted pivoting safety maintains factory drop-safety standards
• Includes replacement sear (logo laser-engraved — color may vary from photo)
• Available in Black, Red, or Flat Dark Earth (FDE — note: FDE finish appears as burnt bronze due to anodize process)

Install Difficulty

Rating: 2 / 5
Tools needed: 1/16″ punch, small hammer, needle-nose pliers (optional).
Time: 15–30 minutes. Disassembly of the fire control housing is required, but the trigger and sear drop directly into the factory frame. No stoning, filing, or modifications to the pistol.

FAQ

Will this work in my FN 509 Compact?

Yes. This kit is compatible with all FN 509 variants including Compact, Tactical, LS Edge, and MRD models.

Does this kit require any permanent modification to my pistol?

No. This is a direct drop-in replacement. No filing, stoning, or permanent alterations are needed. Installation is reversible.

Why does the FDE trigger look different than the photo?

The anodize process on our FDE triggers produces a burnt bronze color rather than a true flat dark earth. This is a repeatable, intentional finish. If you receive an FDE trigger and are not satisfied with the color, contact Customer Service to discuss replacement with Red or Black.

Shipping & Warranty

All orders ship within 1–2 business days. This kit is covered by Apex Tactical’s manufacturer warranty against defects in materials and workmanship. No COD or PO Box shipments. Sales tax applies where required.