I recently moved to Chicago and am unfortunately limited to a max capacity of 12 rounds for mags. I am obviously going to be purchasing 10 rounders, but was exploring the possibility of throwing a +2 mag extension on them. However, I've read on several websites that mag extensions will NOT work on 10 round Glock mags. Can anyone elaborate on the legitimacy of this? Thanks! These will be for my G17 btw.