I still take issue with mr Snider scaremongering like this- in the unlikely scenario that someone would actually be running around with a 60 round mag glock it would likely jam or overheat anyway.
I'd actually expect the 15-round magazines to be more common, given that's the size of magazine the Glock 19 comes with, and they don't stick out of the gun. But then again I'm not convinced any of these guys are carrying more than one magazine anyway (and if they were, they'd be too busy fumbling around in the dark getting the magazine out of their pockets- it's not like gangsters even know magazine holders even exist).
However, if you're using OEM Glock mags, it's not going to jam (don't buy SGM or Promag, not only are they garbage but they aren't even that much cheaper- which, to be fair, gangsters probably think all 'stendos are the same and would thus run into that problem more), and you literally cannot hold enough rounds on your person to make the gun overheat, especially if you're not wearing a competition-style belt designed to hold a bunch of mags. But then again, if your Glawk Fowtay Problem Solva can't solve the problem in 300 rounds you are probably doing something wrong.