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300 vs. 5.56

  1. 5.56 vs. 300 Blackout

    Ok, I am going to post this multi part question to see what everyone thinks and any suggestions you may have. I am building an AR Pistol and I have just about completed it and all I have to get is the barrel and gas tube. I was thinking about getting a 10.5" in 300 Blackout. My situation is I...
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