Erm, the Assault class both of these lmao. If you start changing the weapon loadouts then the classes start becoming totally imbalanced.
For those of you that'll look past them, I mean each class gets a choice of 2 weapons per slot with different base stats. E.G. Replace Assault Rifle with LMG. LMG has a faster fire rate and larger clip size, but poorer accuracy and a longer reload.
This isnt a new idea, something has been discussed on another thread where you can chose another weapon version of the original, where it has a +- effect (ie 10% more power, 10% less ROF)