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1. Apex Action Enhancment Kit While the FN 509 is pretty great right out of the box, the first thing I personally upgraded was the trigger. I opted in for the Apex Flat trigger and couldn't be happier with my purchase. The FN 509 trigger came a bit gritty out of the box and can range from 5.5-7.7 lbs. However the Apex trigger will reduce the factory trigger pull weight to a steady 5.5 lbs. Along with reducing the trigger pu …