I just picked up a 44 for my wife and it has the serial number after the modification (extractor) was made.
Now, in the old days, one would never dry fire a rimfire as the firing pin contacts the chamber's edge, metal on metal, etc, and ran the risk of breaking the pin.
Nope it won't hurt to dry fire. In fact as you have found out, you do have to dry fire to field strip the pistol (just like every other Glock). I don't know if I would sit on the couch and dry fire repeatedly all day long. But the occasional dry fire won't hurt a thing.
I wouldn’t have a problem dry firing to disassemble but myself would not dry fire routinely like I would a center fire pistol. If it bothers you, put an empty case of drywall anchor in the chamber prior to dry fire / disassembly
Yeah, I'm old school. For example, I collect older Smith and Wesson revolvers that have the firing pin physically attached to the hammer. They depend upon some resistance in the chamber to stop the forward travel of the firing pin.
I've talked to more than one gunsmith who talked about having to replace the firing pin on such revolvers, firing pins that snapped off from repeated dry firing. Anecdotal, sure. But it left an impression.
So, I simply don't dry fire anything but my Glocks, and then, only to field strip them.
But rimfires were always different. For the reasons in the OP. But metallurgy has come a long way since the old days.
It's not just metallurgy. Some rimfires' incorporate a firing pin stop which - provided that the stop is present - will ensure that the firing pin cannot go any further (than it needs to go).
Get a snap cap. Open the slide and put one in the chamber. Pull the trigger and then remove the slide.
A box of snap caps are great for getting comfortable with the trigger and getting some extra break in at home.
I was dry-firing mine one day, when it failed to reset and the trigger stayed all the way back. The lug had broken off the firing pin. Not sure if dry firing caused it or not, but that is when it happened.
Like others have said, If you are worried about it use a snap cap.
Repeated dry firing of any gun can lead to failures in the firing pin.
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