It is not uncommon for the last round to not fully extract from the receiver, since there is no loaded cartridge below it in the mag assisting it. I belive this was discussed somewhere on this forum, but not positive on that. The mag follower is not a lot of help to the last expended piece of brass in ejecting. The extractor should extract it, but the process from there can be a problem. Those mag springs usually need to be quite stiff to help everything work.
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