This is my 26X version........
View attachment 1102721
It's a +5 extension that was advertised for the 19/23 but I stuck it on a G26 mag. It actually will hold 16 but you can't insert it with a closed slide with 16. I actually like it better than the slide-on extensions for 15 rnd mags....doesn't slide around like they do.
I still use normal mags with the Pearce +2 ext for carry, but I have used this one extensively at the range and it works fine.
I'm another one who doesn't like the idea of a longer grip on the G26. I can go from 10 flush fit to 12 to 15 to 17, you can't make a long grip shorter.