1415
Wait, not like that
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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.
I look into it. 5.7 is shorter than a .223 and is a much smaller grain.
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.