Congratz on the purchase!
I usually run 2 low caps and a high. Start with the 2 lows, and then the high cap was last. Majority of the time I'd never get to the high. (Or I would but I'd never get more than a dozen or shots off)
The 100 round mid caps are more than enough. I'm not a fan of the box mag on the P90.
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-Matt
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