Wouldn't that damage require high pressure gas behind the case head before the toggle unlocked?
Pierced primer?
What does the tip of the firing pin look like? How far does it protrude from the breech face?
If it was dry fired a lot without anything to stop the firing pin, it may have opened up the firing pin hole in the breech face.
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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