Apex Enhancement Trigger Kit for FN 509 Black

The Apex Action Enhancement Kit for FN509 series pistols is a direct drop-in upgrade that replaces the factory polymer trigger, trigger bar, and sear. The patented Apex design reduces the trigger pull weight to approximately 5.5 lbs while improving overall trigger performance.

The system shortens all relevant travel distances—pre-travel, overtravel, total travel, and reset distance. The trigger offers a smooth, consistent pre-travel and a clearly defined, crisp break.