"Again, and most importantly, I have not noticed any feeding or other reliability issues, and as long as they work- who cares? I am probably wasting time worrying about a non-issue. I just wish I knew what changed in the mag design to cause this, and why. And might it cause an issue down the road with a weaker spring."

Stepping over dollars to maybe pick pennies.

Mark your mags.

Use your mags.

If any mag malfunctions more than 2x, it is a practice mag forever.

Mags are consumables. Treat them as such and MOVE ON.

The glock mag tool is quite nice.

Magpuls 9mm mags come apart easier than OEM mags.

Buy some Magpul mags as your practice mags and save your OEM ones.

See the other mag advice re marking etc.


OTOH, I know guys that have been pounding the same set of 8-10 Basic CMC mags feed lips into spec every so often with a rubber mallet since I first met them for every friday night IPSC in 1991.
4.7-4.9 of Bullseye with a 200 LSWC. It can be a smokey load but it seems to work for them.