Mosin Nagant is two peoples' last name together asdf
I mean, it's not
too complicated, unlike the "KBP/TsKIB-SOO TKb-O146" AN-94 bullpup prototype
which khain btw should totally make :V
Also its bigger than a 7.62X51MM NATO.
hence the 54-- a very large difference of 3 whole millimeters