I guess it depends on how much you dry fire it.
I dry fired my M500, like, maybe, a
thousand times when I first got it.
The firing pin retaining pin eventually broke in two, and the firing pin itself was chewwed up where it made contact with the retaining pin.
I don't dry fire the 500 too much anymore. The Mil-Spec 590 might be more robust.
-boing