Apex originated the drop-in trigger kit for the FNS. The patent-pending design of the Action Enhancement Trigger Kit for the FNS makes a huge difference in the trigger pull characteristics and immediately became a must-have for FNS owners. When installed, this kit will: Reduce trigger pull weight to approx. 5.5 lbs. Reduce trigger pre-travel, over-travel and reset distance Deliver a crisp trigger break Maintain factory safety values with a center mounted pivoting safety Direct drop-in replacement, no fitting required For use in the following FN model pistols: FNS and FNS Longslide, including those manufactured 2014 or later. NOT for use in FN Mfg: Apex Tactical Specialties Inc