I had my AR's out for a run today. I was conservative and only shoot what my mags will hold. So It was close to 175 rounds. We have a 15 round magazine limit. I have a mix of 10 and 15 round mags that I use for target, then I keep 8 - 15 rounds mags with 62 grain AP rounds home for self defense.
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Don't believe everything you read on the internet- George Washington.