Action Enhancement Kit for FN 509 – with Curved Trigger

Description

For FN 509 owners seeking a refined trigger pull without compromising the safety features required for California compliance, the Action Enhancement Kit for FN 509 – with Curved Trigger is a direct drop-in solution. Priced at $160, this kit is part of our Freedom Edition category, designed for shooters who want a crisp, predictable break while maintaining the factory’s internal safety mechanisms.

Apex pioneered the drop-in trigger upgrade for the FN 509, and this kit has become a go-to for owners who demand better performance from their pistol. The patent-pending design delivers a measurable improvement in trigger feel without the need for gunsmithing. Once installed, you can expect:

• Reduced trigger pull weight to approximately 5.5 lbs., offering a lighter, more consistent press compared to the stock trigger.
• Shorter pre-travel, over-travel, and reset distance, giving you a faster, more controlled shooting cycle.
• A crisp trigger break that helps you maintain accuracy shot after shot.
• Factory safety values preserved via a center-mounted pivoting safety, so the kit remains compliant with California’s roster requirements and your personal safety standards.
• Direct drop-in replacement — no fitting, filing, or modifications required. It installs in minutes with basic tools.

Specs and fitment: This curved trigger version is designed exclusively for the FN 509 series. It includes the trigger shoe, a polished sear, and all necessary springs. The sear you receive may differ in appearance from the product photo — if it carries the Apex laser-engraved logo, it has passed all required processes and is correct. The trigger itself is manufactured from anodized aluminum, available in Black, Red, or Flat Dark Earth (FDE).

Important color note: Due to the anodizing process and the materials used, FDE triggers may appear as a burnt bronze color. This is a repeatable, intentional finish — unlike inconsistent results from past vendors. If you order an FDE trigger and are not satisfied with the color, contact our Customer Service team to discuss swapping it for a Red or Black trigger at no extra charge. We apologize for any inconvenience this may cause.

This kit is a practical upgrade for range sessions, home defense, or competition use. It reduces the factors that can throw off your aim — long, gritty pulls and excessive reset — helping you shoot more consistently. Whether you’re upgrading your carry gun or building a more responsive range pistol, the Action Enhancement Kit delivers real, measurable benefits without the need for a professional install.