The 5.56mm NATO round has been the gold standard AR-15 cartridge for well over 60 years. It has been the ammo issued to our frontline soldiers for over a generation and has seen combat on 5 continents in the hands of the U.S. Military and our NATO allies.
Continue reading 300 Blackout vs 5.56mm NATO: The AR-15 Intermediate Cartridge Rumble here: https://ammo.com/comparison/300-blackout-vs-556
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