At least some of the early glocks did not fully support the case-head. Handloads below max had the potential to rupture the case, resulting in blowing out the mag, cracking the frame and blow out of the extractor. This was with a 40sw. I don't know if the newer ones still have this problem. Potentially, hot factory loads could have been a problem in these also as bulged cases were common.
MFH
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