Hello. It's been a while since I looked at a FireStar M40, but on these guns I believe that the firing pin is held in place with a traditional retaining plate rather than the vertical steel pin that fit through a notch in the firing pin. When the trigger is pressed, the internal firing pin safety moves out of the way and the firing pin is free to move w/o hitting anything. I don't think the FireStar series of pistols suffers the same liklihood of firing pin breakage as might older models like the Star Model B, P, and A. Firing pins are hard to get but with the FireStar you are probably OK to drop the hammer at the end of a match. For dry-firing I'd still use a snap cap just to be on the safe side.
Best.
Best.