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A ruler
It look like 1.93
where is .39 on a ruler
45mm.
2.5 cm looks like about 1 inch on a ruler
i inch
A ruler
45mm = 4.5cm
1.77 inches
one and 1/4
6.14" is the length of a U.S. Dollar bill. Measure it with your ruler.
Did you find anything out? I have the same and am wondering why I can find this model in 7.62x397.62 39mm but not th 5.56 45mm...