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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 ...

The AR platform has always been about options. Lately, one of the biggest choices owners are weighing is whether 5.56 still fits their needs better than .300 Blackout. Why this caliber debate has ...