I also think the regular LMG is due for an overhaul, the model looks somewhat different when compared with all the others.
I think you should do an experiment with the Micro SMG, too - add one of those compact stocks, or just a regular stock, and see how it looks as an MP5 instead of MP5k, along with adding a little longer barrel. I think it would turn out good.
In addition to all of this, EVERY loving TIME I TRY TO CHANGE THE MODELS IN THE SCRIPTS, THE stuff NEVER CHANGES GOD loving DAMN IT