At the end of the day, the 300 Blackout and the 5.56 NATO both serve their purposes well. The 300 Blackout is the real heavy hitter when it comes to power, suppression, and close-quarters situations.
Next to the original 5.56mm NATO/223, the 300 AAC Blackout (BLK for short) is the most popular chambering for the AR-15 platform, and, as a result, manufacturers now pump out a wide variety of 300 ...
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