FN designed this pistol with the two most important law enforcement product requirements in mind — safety and reliability! With the patented RSS (Repeatable Secure Striker) Firing System, the firing pin is completely relaxed until the trigger is pulled. The pull is exactly the same each and every time, same pull, same travel. Another unique patented feature is the Extended Modular Slide Rails. Unlike other polymer pistols, the rails are not molded into the frame. Their extended length provides greater surface contact between slide and frame for superior accuracy. Available in 9mm and .40 caliber.