I sat down last night and added the Arredondo Base Pads to all of my new (Gen 4 maybe) G22 mags. I had also purchased 6 of the Arredondo followers, and was hoping to use them on my 20 round magazines, but they did not work properly. My 20 rounders now all lock the slide back, but are using the original G22 follower!
I surmised the Arredondo followers were for older style (Gen 3) magazines.
I pulled out all of my older magazines, and replaced all the springs and followers with +10 springs and Arrredondo followers. I have a mixture of Gen 1-4 magazines, for the G22 and G23, both DF and NDF.
All mags now seem to function 100%, but I have yet to put them to use on the range!