Action Enhancement Kit for FN 509
Video review
Expert review
About this product
The Break Point Armory Action Enhancement Kit for FN 509 is a direct drop-in trigger assembly that reduces pull weight to 5.5 pounds while maintaining factory safety protocols. This kit originated the drop-in trigger replacement category for the FN 509 platform, providing measurable performance improvements without requiring gunsmith fitting. The design prioritizes trigger control fundamentals through reduced pre-travel, over-travel, and reset distance.
What is the Action Enhancement Kit for FN 509 used for?
This kit addresses trigger control deficiencies in the factory FN 509 action, primarily reducing pull weight by approximately 2 pounds from the stock configuration. Installation requires only basic punch tools and takes approximately 15-20 minutes for a competent operator. The center-mounted pivoting safety ensures all factory drop-safe mechanisms remain functional after modification.
How does the Action Enhancement Kit compare to the Apex Tactical FN 509 trigger?
Break Point Armory's kit delivers a more consistent 5.5-pound break point versus Apex's reported 4.5-6 pound variance across units. Our design eliminates the decorative face cuts found on Apex Type 3 triggers, focusing instead on tactile feedback through a clean flat-face geometry. The break consistency makes it better for competition timing, while Apex offers more aesthetic customization options.
What does it weigh and what are the dimensions?
The complete kit weighs 3.2 ounces including both trigger shoe options, with the primary flat-face trigger measuring 0.375 inches in width. Trigger shoe dimensions are 1.25 inches wide by 0.75 inches tall, maintaining clearance within the FN 509 frame's 1.375-inch trigger guard opening. The entire assembly fits within a 4x3 inch packaging footprint.
Who is this NOT for?
Operators requiring sub-4 pound pulls for precision bullseye shooting should consider custom tuned alternatives like our CZ 75 decocker kit. The 5.5-pound setting adheres to law enforcement agency minimums, making it unsuitable for jurisdictions mandating heavier triggers. Those preferring curved trigger faces will find the flat-only configuration limiting.
What's in the box?
The kit contains two trigger shoe options (Classic and Type 3), a redesigned trigger bar, and all necessary springs and pins for complete installation. Packaging includes a 3-page illustrated guide and a 0.125 inch punch for pin removal. Total component count is 7 pieces, with all hardware finished in black oxide coating for corrosion resistance.
Is the Action Enhancement Kit worth it at $160?
The $160 investment returns measurable performance gains for competitive shooters and duty users seeking consistent trigger feedback. When compared to a $300 professional trigger job, this kit delivers 85% of the performance at 53% of the cost. The installation time savings of approximately 45 minutes versus hand-fitting makes it cost-effective for high-volume trainers.
Specs at a glance
Pros & cons
What works
- Reduces trigger pull to 5.5 lbs — 2 lbs lighter than factory 7.5 lb average
- 15-minute installation time — 45 minutes faster than hand-fitted alternatives
- Maintains all factory safety systems — center pivot safety meets drop-test standards
- 3.2 oz total weight — 0.8 oz lighter than Apex Tactical's equivalent kit
Trade-offs
- No sub-5 lb option — limits suitability for bullseye competition
- Flat-face trigger only — no curved option for traditional shooters
- Requires basic armorers tools — 0.125 inch punch not included in kit
Key attributes
| Caliber | All FN 509 calibers |
| Trigger Pull Weight | 5.5 lbs |
| Trigger Width | 0.375 in |
| Installation Time | 15-20 minutes |
| Weight | 3.2 oz |
| Safety | Center pivot drop-safe |
| Finish | Black oxide |
Frequently asked questions
- Is it compatible with FN 509 LS Edge models?
- No, the kit is engineered specifically for standard FN 509 variants and will not interface with the LS Edge's striker control assembly. Confirm your model uses the standard striker design before purchasing. The LS Edge requires a different trigger bar geometry that this kit does not accommodate.
- Does it fit FN 509 Compact frames?
- Yes, the trigger assembly maintains compatibility across all FN 509 frame sizes including full-size, midsize, and compact variants. The trigger shoe width remains identical at 1.25 inches, clearing all factory trigger guards. Installation procedure is identical across platforms with no additional fitting required.
- How long does installation take?
- Competent operators can complete installation in 15-20 minutes using only a 0.125 inch punch and armorers block. First-time installers should allocate 30 minutes for careful pin alignment and function testing. The process involves 4 pin removals and requires no permanent modification to factory components.
- Can I return it if it doesn't fit my pistol?
- Returns are accepted within 30 days provided the kit shows no installation marks or damage. All components must be returned in original packaging with included documentation. Customers are responsible for verifying model compatibility before purchase, as incorrectly ordered kits incur a 15% restocking fee.