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My G17 gen4 does seem to eject the cases a little straighter up than other Glocks I have shot, but it seemed to be more noticable when it was brand new.
Lugger i find the Gen 3 throws them 8 feet at 4 oclock. If my sons shoots with consistent strong modified weaver i can stand in one place and catch almost all 20 rounds(2 mags), Don't remember them going straight up yet. If you have a very rigid weaver type stance and have to shoot down at targets?