I’ve read glock reps have stated they intentionally designed this gun this way, but I couldn’t find it in their online Manuel. I wonder if they didn’t want it in writing. I think even glock has stated something like “don’t excessively dry fire” while it’s common knowledge you can.
I don’t know. I don’t get to dry fire enough to worry about it anyway 
, and I don’t worry about my Glock much.
Glock reps always recommend dry firing with snap caps. It’s just what they do. I saw one cornered in a gun show about whether dry firing damages the gun and he couldn’t say it did.
Don’t dry fire without a snap cap?
from experience…
DEPENDS on the when the firearm was made IMHO…
the metallurgy now verse back a ways can make a difference!
with a older 1911 it is possible to stretch or push the metal around the firing pin hole outward…
enough so a casing can literally get stuck on it… takes a lot of dry firing though…
this probably holds true with many older firearms and a good reason for the creation of snap caps etc…
I remember, back all of those years ago, my dad had a Model 12 shotgun. If memory serves, when they would walk off the firing line (trap shooting) they would dry fire first just to make sure. One time, at the start of a round he was getting blow back in his face, seems the tip of the firing pin had split so it would poke a hole in the primer. The thought was dry firing was the cause, after that he would carry an empty shell with a nylon primer for dry firing.