Is it the famas? or one of the engeneer weapons? what weapon in bf4 has the highest rounds per minute?
The FAMAS and CZ-3A1 are tied for the highest rate of fire. Both fire 1000 rounds per minute, though this doesn't take reloading into account.
The famas is one of the 2 fastest weapons in the game, beside to the CZ-3A1 wich both fire at 1000rpm.
The fastest PDW is the CZ-3A1.
If you are looking for a awesome CQC-Dominator, i recommend you the MTAR-21. It's far more controllable. It comes "only" with 900rpm (wich still is insane) but has a balanced spread (0.42;0.42,0.34) (left/right/up) and lower first-shot multiplyer (2,8) than the CZ-3A1 which comes with (0.30;0.55;0.40) and (3,3).
Let's compare MTAR-21 with CZ-3A1:
RECOIL per shot left /right / up MTAR 0.42 / 0.42 / 0.34 CZ 0.30 / 0.55 / 0.40
This means, the MTAR has a higher recoil in general but it spreads in all directions while CZ mainly to the upper right, which makes it really hard to controll. Also, this is per shot. CZ has >10 more rpm which means if you want to know the recoil over fullauto time, you have to multiply the CZ Recoil by 1,11 (1000/900)
SPREAD standing / walking MTAR 0.35 0.625 CZ 0.4 0.6
So the MTAR has a 12,5% lower spread while standing still, and the CZ a ~4% lower spread while walking. CQC is mostly walking, but the 4% aren't a lot, 12,5% is.
SPREAD increase per shot MTAR -> 1.117 CZ -> 1.3
This tells everything. Even if the CZ has better spread on first look, this only lasts for 2 shots (ignoring first shot, which is negated by first-shot multiplier).
In the end, also the MTARs spread lowers 10% faster after shoting, which makes it a better for micro-busting than the CZ.
CZ really has the better rate of fire, but thats all. In any other handlingstatistics, MTAR is better and this is what practice has told me too. Awesome weapon for CQC.