You can actually get a 30 round mag for the Glock just as you can the Uzi.
Sportsmans Guide catalog shows a 50-round drum magazine that attaches to a Glock. I'm not kidding.
Oh god, check that beast out.
Personally i'd be happy with a 15 to 30 round straight clip for the Glock, but hey if you need a 50 rounder go for it.
