For assault? I like the F2000 with the Foregrip, heavy barrel, and red dot sight. Pros – Fast rate of fire in close quarter combat, Fairly large magazine. Con’s – No range, and if your target is mid-far distance either forget it, or fire in controlled bursts.
Also as mentioned, look at the M249 And M16. When you get to level 43 you get explosive shotgun shells, which is giving me the chubb. BOOOOOM!