The famas preforms better without a scope than the m4. Personally, I never use the m4 without a scope, because without one, it's a run of the mill average gun. The famas will work better if you like to use your guns stock, but if you like to add on the bells and whistles the m4 is the choice for you. Purely because the m4's main selling point is its abilties to keep all its bullets in one spot, while scoped in of course.