Action Enhancement Kit for FN 509 – with Curved Trigger

Description

For FN 509 owners shooting in Arizona conditions—where heat, dust, and suppressor use are part of the daily routine—the Action Enhancement Kit with Curved Trigger delivers a measurable upgrade in control and consistency. Priced at $160, this kit is built for shooters who need a reliable, repeatable trigger pull without compromising safety or durability.

Real-world performance in desert environments
The patent-pending design, originated by Apex, directly addresses the trigger characteristics that matter most when you’re dealing with high temperatures, blowing dust, and the added back pressure of a suppressor. After installation, you get:

• Reduced trigger pull weight to approximately 5.5 lbs. – A noticeable improvement for faster, more controlled shots without going too light for carry or duty use.
• Less pre-travel, over-travel, and a shorter reset distance – Keeps your finger closer to the next shot, especially useful when follow-up speed matters in dynamic shooting.
• A crisp, clean break – No mush or creep, giving you a defined wall that builds confidence at distance or under time pressure.
• Full factory safety values maintained – The center-mounted pivoting safety design means you don’t sacrifice drop-safety or reliability for a better feel. This is critical in high-dust conditions where debris can affect internal parts.
• Direct drop-in installation, no fitting required – No filing, polishing, or gunsmithing. Remove the factory parts, drop in the kit, and you’re back to shooting. That matters when you’d rather spend time on the range than at the bench.

Designed for suppressor use
The shorter reset and reduced over-travel become even more valuable with a suppressor attached. The added gas and slower cycling can exaggerate trigger slop. This kit tightens everything up, giving you a more predictable break and reset even when running suppressed in hot, dusty conditions.

What you need to know about trigger color
The Flat Dark Earth (FDE) triggers are produced via an anodize process that results in a burnt bronze tone—repeatable and consistent, but different from standard FDE. If you receive an FDE trigger and prefer the look of Red or Black, contact our Customer Service team and we’ll arrange a replacement. No hassle.

Sear color variance
The sear you receive may not match the photo exactly. If the Apex logo is laser engraved on it, it has passed all necessary processes and is correct. Color differences do not affect function or fit.

Fitment and specs<br