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If it fired "rectangular" caseless ammunition, then it's NOT a "5.56x45mm". That refers to a very specific cartridge. It may have fired an identical bullet at identical velocities, but it's not a 5.56x45mm. Hell, a .223 Remington isn't a 5 56x45mm, even though they are almost identical. Also seems like there's a lot missing here; where's the the rest of the story? AnnaGoFast (talk) 20:58, 25 January 2016 (UTC)