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What should I build next?
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Respectfully, if you're into ARs, do a bipoly. It's by far my favorite AR lower, cost is about $100, I've had mine for over a year now, has ran about 2k rounds through it, I'd trust it with my life. It pairs with any upper you want, I use it with a bca 5.56 upper and a cmmg 9x19 rdb upper.