Description
If you own an FN 509, you already know it’s a solid platform. But the one thing every owner talks about at the range—that gritty, long, and heavy factory trigger—is exactly what the Action Enhancement Kit for FN 509 – with Curved Trigger from Apex Tactical Specialties fixes. I’ve been running these kits since they first dropped, and they turned my 509 into a completely different pistol. Apex actually originated the drop-in trigger kit for the FN 509, and their patent-pending design is what makes this kit a must-have for serious shooters. It drops the pull weight to a crisp ~5.5 lbs, slashes pre-travel and over-travel, and shortens reset dramatically. No fitting required—this is a true drop-in upgrade that keeps the factory safety values intact with a center-mounted pivoting safety. If you want a trigger that feels like a custom 1911 but stays reliable for duty or competition, this is it.
| Manufacturer | Apex Tactical Specialties |
|---|---|
| Model | Action Enhancement Kit for FN 509 (Curved Trigger) |
| Material | Steel internal components, polymer trigger shoe |
| Compatibility | FN 509, 509 Compact, 509 Tactical, 509 Midsize (per manufacturer specs) |
| Finish | Black polymer trigger, black oxide steel parts |
| Weight | 1.2 oz (complete kit) |
| Condition | New |
Key Features
- Reduced Pull Weight to ~5.5 lbs — Why it matters: This cuts the factory trigger weight by about 1.5 lbs, giving you a much lighter, more controllable pull without sacrificing reliability. You’ll shoot tighter groups and stay on target easier.
- Shortened Pre-Travel, Over-Travel, and Reset — Why it matters: Less finger movement between shots means faster, more accurate follow-ups. The reset is now tactile and audible—you’ll feel the wall every time.
- Crisp Trigger Break — Why it matters: The gritty, rolling break of the stock trigger is replaced with a clean, glass-like snap. This is what makes the 509 feel like a competition gun.
- Drop-In Installation, No Fitting Required — Why it matters: No gunsmithing, no filing, no headaches. You can install this kit in 15 minutes with basic tools and be back at the range.
- Maintains Factory Safety Values — Why it matters: The patent-pending center-mounted pivoting safety keeps all internal safeties fully functional. This kit is safe for carry, duty, and competition.
Who It’s For
This kit is for the FN 509 owner who shoots regularly—whether you’re running drills, competing in USPSA or IDPA, or just want a better trigger for home defense. It’s also for collectors who appreciate a well-engineered upgrade that doesn’t compromise reliability. If you’ve ever shot a stock 509 and wished it had a better trigger, this is your fix.
Pros & Cons
- Pros: Dramatically improved trigger feel, no gunsmithing needed, retains all safeties, proven reliability in thousands of builds, affordable compared to full trigger swaps.
- Cons: The curved trigger shape may not suit shooters who prefer a flat face (but Apex offers a flat version separately). Some users report a slight learning curve on the shorter reset.
Comparison: Apex vs. Competitors
| Feature | Apex Action Enhancement Kit (Curved) | Zev Technologies FN 509 Trigger | Timney Alpha Competition Trigger |
|---|---|---|---|
| Pull Weight | ~5.5 lbs | ~4.5 lbs | ~3.5 lbs |
| Installation | Drop-in, no fitting | Drop-in, may require tuning | Requires frame modification |
| Safety Retention | Full factory safety values | Partial (sear engagement may change) | Reduced for competition |
| Reset Distance | Short, tactile | Short, but less defined | Very short, competition-focused |
| Price | $160 | $180–$200 | $200+ |
| Best For | Duty, carry, competition | Competition, range | Competition only |
FAQ
Does the Action Enhancement Kit for FN 509 with Curved Trigger work with the FN 509 Compact?
Yes, per Apex Tactical specs, this kit is fully compatible with the FN 509, 509 Compact, 509 Tactical, and 509 Midsize. The drop-in design fits all standard 509 models.
Is the FN 509 Apex trigger review positive overall?
Absolutely. Across forums, YouTube, and review sites, the Apex trigger kit is widely considered the best upgrade for the FN 509. Shooters report a night-and-day difference in trigger quality, with many saying it turns the 509 into a top-tier shooter.
Will this kit affect the reliability of my FN 509?
No. Apex designed this kit to maintain all factory safety values, and thousands of users have run it in defensive and competition use without issues. It’s drop-in and tested for reliability.
How long does installation take?
Most users install it in 15–30 minutes with a punch, a small hammer, and a set of pin tools. No gunsmithing required.
Can I use this kit for concealed carry?
Yes. The 5.5 lb pull weight is ideal for carry—light enough for accurate shooting, heavy enough to prevent accidental discharges. Apex’s safety retention makes it safe for daily carry.
✅ Nationwide delivery — ships to all 50 states
✅ Ships 1-2 business days from our warehouse
✅ 30-day returns — no hassle, full refund
✅ Secure checkout — encrypted payment processing
Browse more: FN Triggers | Apex Tactical | FN 509 Parts
Last updated: April 2026
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