Action Enhancement Kit for FN 509

Description

For FN 509 owners who demand a better trigger without the hassle of hand-fitting or gunsmithing, the Action Enhancement Kit delivers a genuine performance upgrade. This complete drop-in assembly replaces your factory trigger and sear with precision-engineered components that dramatically improve the feel and consistency of every pull. Designed and manufactured by Apex, the originator of the drop-in trigger kit for the FN 509, this patent-pending system addresses the most common complaints about the stock trigger while retaining all factory safety features.

What This Kit Does for Your Shooting

The most noticeable change is a reduction in pull weight to approximately 5.5 pounds — a significant improvement over the stock trigger. But weight reduction is only part of the story. The kit also shortens pre-travel, over-travel, and reset distance, giving you a faster, more predictable cycle between shots. The break is crisp and clean, with no grit or stacking, so you can maintain accuracy during rapid strings or precision slow fire. Because the kit uses a center-mounted pivoting safety, all factory safety values are preserved — critical for responsible firearm ownership in California.

Installation and Fitment

This is a direct drop-in replacement. No fitting, filing, or stoning is required. Remove your factory trigger assembly, install the Apex kit, and you’re ready to go. It works with all standard FN 509 models, including the 509 Compact, 509 Tactical, and 509 Midsize. The kit is compatible with standard factory lower receivers and requires no modifications to your frame or slide.

Two Trigger Styles to Choose From

• Apex Classic Trigger: Features a smooth, flat face with radiused front corners. The visible sides are flat with no decorative cuts, giving it a clean, understated look. Ideal for shooters who prefer a simple, functional design.
• Apex Type 3 Trigger: Adds chamfered front corners and decorative face cuts on the visible sides. The visual distinction is subtle but noticeable, with the same excellent performance as the Classic. Choose this if you want a slightly more aggressive aesthetic.

Both triggers use the same internal components and deliver identical performance — your choice comes down to appearance.

Important Color Note for California Shoppers

Due to ongoing supply chain issues, we have discontinued FDE (Flat Dark Earth) triggers until further notice. We are actively working to source a new anodizing shop that can match our color specifications. If you previously received an FDE trigger and are unhappy with the color, please contact our Customer Service team to discuss replacing it with a red or black trigger. We apologize for the inconvenience and are committed to