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I don't know. It's not as ez to fire an AR out of battery as say an AK or SKS. The bolt has to rotate almost completely for the firing pin can protrude through the bolt. The primer is flat and has a deep indention. It is also in the case. I think the pressure was too high when the bolt unlocked. If it was not an AR I would be on board with the out of battery idea. A high primer may cause it to fire prematurely, but It should not have the pin dimple.
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