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There are many differences, but the most significant is the fact that the .223 Remington bullet diameter is 5.56 mm and the 5.45 x 39 is 5.45 mm. They are not interchangeable if that's what you are wondering.
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"The American military is like a finely crafted sword. To be effective, it must be wielded by a discerning, skilled and merciless hand."
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