I now own 3 x KJ Glock green gas mags and 3 x KJ Glock CO2 mags, they are my favourite Glocks mags so far of all the ones I've tried due to their complete compatibility across platforms, especially the CO2. Below is my experience, strictly concerning Glocks with steel slides (Your mileage may vary for your models):
The model I own/owned are as follows, all full steel: WE x RA-Tech G17, KJ x Guarder G23, TM x Guarder G34, Stark Arms "premium version" full steel G17.
KJ CO2 mags not only works on all the steel builds, it also has very minimal base (same as green gas), unlike other brand such as APS which I have yet to try. WE for instance, while being very minimal, barely cycles on my KJ and TM Guarder steel builds, it does however cycle the Stark Arms gun with good recoil, but bizarrely only at 130 fps. The KJ green gas magazines also works the best for all models, the crazy thing is that it works far better on Stark Arms steel guns than Stark Arms green gas magazine... TM mag goes into a Stark Arms gun, but the mag catch does not fully engage and falls off easily.
Hope this helps for anyone who's thinking about which steel Glock to go for.
Edited by blobface, Today, 11:07 AM.