Any mag made for Glocks NOT made by Glock is junk. Once again, rid the earth of these.
That's for darn sure! +1. Folks, don't be tempted by these 8-9 dollar Korean mags. They're fine for range practice, but DON'T USE THEM FOR CARRY MAGS!

Glock mag springs WILL die. You leave the mag loaded in the safe, you kill the springs after about 6 months. There are no magical mag springs out there that never die. This is a myth. I've heard this myth perpetuated for years now. No magical springs, replace the mag springs regularly and you will be fine.
OK, this is the first I've heard of this. I don't think it's accurate. From everything I've researched, it's not leaving rounds loaded in any magazine that causes damage, it's the constant reloading and unloading that weakens springs in any magazine.