Understood. If you already have a 10 round mag for your G26 you are good to go. However, you cannot put more than 7 rounds in it.
Future G26 mags will be limited to 7 round capacity.
I think the Glock guys in Austria are reprogramming their machines to produce 7 round mags for every size gun they have. Gaston will make a bundle with this new law as people get rid of their 13, 15, 17 whatever round Glock mags.