Please forgive my confusion and or lack of FN knowledge. New to the forum. I just got a 57, my first FN. Absolutely love it. Thinking about maybe an FNS9 or 40. I have an XDM 40 which is single action striker fired. The factory website lists the FNS as double action. So am I correct in thinking that if you rack the gun a round is in battery and ready to fire (SA) and maybe it has a decocker to make it ready and safe and thus double action is necessary to fire the gun?