There are three assault rifles in the game that all have very different stats compared to the rest of the ARs, but, coincidentally, are very similar to each other.
These weapons are AK15, SCAR-H, and the FAL. This group shares very high damage values, slower firerate, super high recoil, and above average ballistics.
I think it'd be convenient to put these weapons in a unique category titled "Battle Rifles", which are weapons chambered to fire a full-power rifle cartridge. I'd also include the G3 since it's considered a battle rifle in our dimension.
These would be available to Assault and Engineer of course; they already have these weapons. I'd also throw in Support to spice up that class. I believe BRs would fit with them quite well.
EDIT:
Medic also has access to SCAR-H, AK15, and FAL, forgot to mention that. They do not have access to G3.Thank you refract0r for catching this mistake.
What do you guys think? Feel free to discuss!