Up until the introduction of the 300 Blackout, the only mini 0.30-caliber cartridge anyone was shooting out of an AR15, or mini bolt-action rifle, was the 7.62×39 Russian. Unfortunately, as wonderful ...
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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