The FNP's had the two hole release points. The FNX uses a .028 Allen set screw to retain the safety lever. Don't pry on it without loosening that set screw. It's the same size allen wrench as the Crimson Trace lasers use to adjust their windage and elevation if you have a Crimson Trace laser on anything. Otherwise you'll probably have to order a small allen wrench set online.
-Mike
http://www.amazon.com/Wiha-35393-L-Key-Plastic-Holder/dp/B003N9B6BC
-Mike
http://www.amazon.com/Wiha-35393-L-Key-Plastic-Holder/dp/B003N9B6BC

