The AKM's name reads "A-KM", and the description also reads "A-KM" and refers to its predecessor, the AK, (commonly AK47) as "A74-K".
Previously this was correctly spelled, so if the change is intended, merely rearranging the letters in the names results in an inconsistent or confusing nomenclature.
If it's supposed to have fictional names, it would be better to invent specific names for the weapons used in Chernarus.
For example, the Romanian designation for their domestically-produced AKMs was "PM md. 63" (Submachine gun model 1963). And their version of the AKS-74 was designated "PA md. 86" (Automatic rifle model 1986). Maybe Chernarus could have some similar designations. Name doesn't even need to have the letters "A" or "K" in it.
I think either correct, or at least some more consistent names, would be better instead of rearranging the letters.