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Geeez... I was just trying to keep it simple... not give a whole detailed thesis on the differences......
the real point is simple.... if it's a 5.56 / .223 barrel you can shot both ammos in it, if it's purely .223 you can only shoot .223 in it (gee ... just like a .357 & .38 ..they aren't dimensionally the same either).
So, buy the one that shoots both and quit worrying about it.
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