famas v1 box uses a specific gear motor combo that unfourtinatly does not allow you to go to more than a m100 spring. you can mod it to take a standard motor. i have yet to look into this, only heard tell of it.
also the guns are super creaky... i think its put together in a different fashion and the creaking is a sympton. i have the tm sv or "g2". dunno if the f1 is any different.
so if your leaving it stock and are not gonna qq about shooting sub 300 like most nubs than i say atleast find your self a tm.
btw i paid $150 for mine with 4mags and vest. dont get fleeced.