.223 Calibre although .223 Will fit on a 5.65 mm, a
5.65 mm Will not fit in a .223 calibre chamber.
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It is: 565 mm = 56.5 cm
MM or mm are Roman numerals equivalent to 2000
9mm is cheeper cause it's a smaller round.
The equivalent of the Roman numeral MM is 2000
If you mean as in Roman numerals then MM is equivalent to 2000