Man it would really suck balls everyone giving you shit over it if it was a mechanical failure. Tryna think how an AR could "just go off" though. I can see how the safety can get flicked off by gear - happens all the time. You would have to be real unlucky to get some gear inside the trigger guard to trip it, especially a stock mil-spec trigger. Unless the trigger was badly worn maybe. Will be interesting to see the out come of the investigation.
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