The 300 Blackout is a round based off the 223 shortened and necked up to 30 cal. It is extremely popular to its quiet characteristics when shooting suppressed. It is one of the most quiet calibers out there. It is also formidable competition to the 7.62x39 when using 125gr bullets at 2250FPS with equal energy and more accuracy than the Russian round. It also works much better and is more reliable in an AR platform than the 7.62x39 and you can get 30 rounds in a magazine.
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