Looks like an atypical case head separation, the rim and head ripped off under extraction. Fairly easy to remove the case (broken case extractor or chamber cast and a dowel), but I would be more interested to find out how/why it happened before giving the gun back to the owners. Recommend that they either take it to a smith and let him give it the once-over before shooting it again, or call Glock and send it in for a checkup.
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