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Apex Tactical's FN 509 Action Enhancement Kit is designed to improve the performance of your pistol's trigger. By installing this kit, you can expect a lighter and smoother trigger pull, less pre-travel, and a shorter overall pull length. Additionally, the kit allows for a faster (shorter) reset time. This easy-to-install kit is a replacement for your 509's factory trigger, trigger bar, and sear, and therefore can be done as a DIY trigger upgrade by anyone who is handy with tools and comfortable following instructions.

Here are some features of the kit:
- It's a drop-in replacement for the factory trigger, trigger bar, and sear.
- It will not alter the function of your pistol's factory safeties.
- The trigger shoe is made of machined aluminum with a matte black hard-anodized finish and a flat face.
- The sear and trigger bar are made of polished stainless steel.
- The kit is compatible with FN 509 pistols chambered in 9mm Luger or .40 S&W.
- It comes in black, red, and FDE.

When the Apex FN 509 Action Enhancement Kit is installed, it will reduce the trigger pull weight to approximately 5.5 lbs. (the actual weight may vary slightly depending on the specific pistol). Unlike the plastic factory trigger, Apex's trigger shoe is made of machined aluminum with a flat face design that provides a more comfortable feel and improved precision, similar to a 1911 target trigger. Additionally, the kit will not compromise the safety or function of your pistol's trigger safety, firing pin safety, drop safety, or out-of-battery safety.