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300 Blackout upper

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5.56 vs. .300 Blackout Uppers: What to Know

March 27, 2025
300 Blackout upper

Two of the more popular calibers for AR-style rifle builds are 5.56 NATO and .300 Blackout. They are also fairly similar calibers but quite distinct with respect to the relative advantages and disadvantages they offer. So, whether you intend to build with a 5.56 or a .300 Blackout upper, here are a few things to […]