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Friend of mine had this lil doozy on an M4 today.
That hole is from the extractor supposedly breaking off into the cartridge. Not sure if it happened during FA or not.
My guess is an OOB shot combined with bad ~30 year old warehouse 5.56.
Edit: Was during FA fire.
That hole is from the extractor supposedly breaking off into the cartridge. Not sure if it happened during FA or not.

My guess is an OOB shot combined with bad ~30 year old warehouse 5.56.
Edit: Was during FA fire.