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:welcomesigntb3: to the Forum, regrettably I can't assist with your problem. I don't have a FNX 9 just a 45 and it works fine either single or double action. Is it the same with and without an empty magazine in the firearm? Have you ever dry fired before and most say it is OK but I would suggest getting some snap caps if you plan on dry firing a lot. It is a good exercise to get used to just moving your finger on the trigger without moving your hand. Good luck, someone will be along soon that should be able to assist.