True, but I'm not going to shoot my Glock at 400 plus yards. I will shoot my rifle at those ranges and expect the ability to make first round hits. That rules out the AK.Yep. Another good caliber you can have if you're wiling to drop an extra $100 on the conversion barrel.
I have never tried shooting 9mm out of my .40 mags though I have been told by more than one very experienced shooter that it works fine. I do have some dedicated 9mm G17 mags for my G22 and they work perfectly.
I stockpile 9mm and .40 cheap and deep. I have a number of a few thousand rounds and anything over that amount is what I train and practice with.
Now if we can only get more of you guys to accept the reality that the AK is the Glock of rifles... Sorry, I had to...