Action Enhancement Kit for FN 509 – with Curved Trigger

Description

The FN 509 is a proven platform, but its factory trigger can leave performance on the table. This Action Enhancement Kit, featuring the curved trigger, directly addresses the stock trigger’s shortcomings to give you a cleaner, more predictable pull. Developed by Apex—the original creators of the drop-in trigger kit for this platform—this patent-pending design is a functional upgrade for duty rigs, competition shooters, and anyone who demands serious performance from their sidearm.

This kit delivers measurable improvements you will feel immediately. Trigger pull weight is reduced to approximately 5.5 lbs, striking a balance between a lighter break and maintaining a safe, usable weight for high-stress situations. Pre-travel, over-travel, and reset distance are all significantly reduced, giving you a shorter, more positive reset that speeds up follow-up shots. The break itself is crisp and clean, eliminating the gritty, rolling feel of the factory trigger. All factory safety values are preserved thanks to the center-mounted pivoting safety, so you get a better trigger without compromising reliability.

Installation is a direct drop-in replacement. No fitting, no filing, and no gunsmithing required. If you can field strip your 509, you can install this kit. The curved trigger profile provides a consistent finger placement that many shooters prefer for precision shots and extended range sessions.

Kit specifications & fitment:

• Trigger pull weight: Approximately 5.5 lbs.
• Reduces: Pre-travel, over-travel, and reset distance.
• Break: Crisp and clean.
• Safety: Factory safety values maintained with a center-mounted pivoting safety.
• Installation: Direct drop-in replacement, no fitting required.
• Compatibility: FN 509 series (full-size, compact, and midsize models).

Important notes on trigger & sear colors:

Due to the nature of the anodizing process and the materials used, Flat Dark Earth (FDE) triggers may appear as a burnt bronze color. This is a repeatable, intentional finish. If you receive an FDE trigger and are unhappy with the color, contact our Customer Service team to discuss replacing it with a Red or Black option. Regarding the sear: the sear you receive may look different than the one in the product photo. If the Apex logo is laser engraved on it, the sear has passed all necessary manufacturing processes and is correct. We apologize for any inconvenience this may cause.

This is a direct upgrade for shooters who want a shorter, cleaner trigger pull without the hassle of complex