What's Better 556 or 300 Blackout?
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You can use a standard 80 percent lower and mill it out when building a 300 Blackout without an issue. The difference between AR 15 Kits in 300 Blackout and 5.56 is essentially just the barrel. Barrels are not the easiest part to swap on a rifle, but a shooter can swap uppers in all of three seconds.
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