One thing that I never got a straight answer for from any qualified source out there: How can anyone be sure that these things happen ONLY under dry firing or whether or not dry firing actually has a more negative effect on the gun than firing with a live round in the chamber (in other words, under normal intended operation)?
Everyone talks about how rimfire firing pins tend to break upon dry firing and it even says so in many rimfire owners' manuals... although dry fire might not be a good idea due to pointless usage of the gun's internal components, I've seen at least two firing pins break (in modern guns) at the range while the owners were attempting to blast off a few 22LR. The guns were not dry fired in the past, were clean and under normal operating conditions at the range, yet the pins would still snap in two... how come?
All I'm saying is that this theory is untested. The peening and deformities or snapped springs that come about with time could also be due to the firearm's design and, whether you dry fire it or fire it with cartridges at the range (live fire), the same type of damage could occur after the exact same amount of use. I think the best solution is to limit the usage of older guns altogether and not only limit dry fire. The constant and untested demonizing of dry fire might lead one to believe that "normal use" will not ever cause any damages to the gun, which is obviously a flawed conclusion.
It would be really cool if someone out there would actually do a study of dry fire effects (Guns & Ammo magazine, etc), as I've never seen anything convincing. They could buy many examples of exact same guns and fire half with snap-caps type of devices while the other half with nothing but dry fire, all in a lab environment (cocked and fired by pre-programmed machines to assure consistency). After every thousand or so cycles, they would stop the test and inspect each gun for developing damages. Only then would we be able to positively say what kind of damage dry fire is actually responsible for, other than what's to be expected under normal operating conditions.
P.S. It is also important to assume that certain types of firearms can be more prone to damage than others, of course. As an example, does it really hurt a flintlock beyond normal operating "damage" when you dry fire it with no powder in the pan? Although I don't think so, I'm sure some would argue that it still does, lol...
