I'm not sure how I overlooked this. I have enough experience with AR-15s (hence the name) to know that this doesn't make sense.
Only two explanations:
* The shooting was staged. (Unlikely)
* There were multiple shooters. (Likely)
Stay safe.
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I know this is bad, but what if when he was shooting up the place he was thinking "Double kill", "triple kill", "head shot", "360 YY prone no scope wallbang". Just a thought.