• Dr. Coomer@lemmy.world
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    9 months ago

    Maybe the original was 5.56mm and some dumbass decide “nah, not enough b u l l e t, better make it 5.7mm.”

    • alcoholicorn
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      9 months ago

      OK, so there is a 5.7mm, that’s the same diameter as 5.56/.223, but it’s not compatible with either because of the french.

        • alcoholicorn
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          9 months ago

          Kinda?

          The case is both shorter and narrower than 556/223, so it won’t even sit right in anything not designed for it. But FN makes quite a few guns that use it.