Today’s spotlight is on a very special set from Barnes Precision Machine–an AR-15 with uppers in both 5.56 and .300 AAC Blackout. Why two upper receivers? That is the brilliance of the Blackout. 300 AAC was designed from the ground up to work with all existing AR-15 components except the barrel. Magazines, bolt, and all the internal parts are identical. But the real benefit comes from active training.
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