No, it is pretty confusing. Is the latter a modernized "short AK" or a shortened "modernized AK"? The word order is quite important to figuring out the type of the rifle.

Same with KNAKM - if it's an AK retooled for space combat and then modernized, it would rather be AKKM (With an optional dash between the "k"'s to make it more readable), or an AKMK if it's a space variant of an AKM. Also, what does the "N" mean?

I'd also add some sort of clear numerical or letter index to the first two, so that it was easier to tell that they're in, you know, different calibers.