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 saw a vid on YouTube where they fired an ar till it melted down enough to make it inoperable and that was around 700 rounds. And all he did was shoot reload repeat. Never made it to 1000.