Using only American weapons, the M16A1 and M4A1 both have an ROF of 6, as does the the M249. By contrast, the M2HB, the M240, and the M60 all have an ROF of 4 (though they all have lower cyclic rates IRL too).
One thing I'd note is that the M16A2 has an ROF of only 3, despite having a higher cyclic rate than the A1. It's seemingly explained away by stint of the M16A2 having a 3-round burst mode. This means that it may not only be cyclic rates being used to determine ROF.
Then again, it seems like most weapons that have a cyclic rate of 400-650 rnds/min get an ROF of 4. Weapons with a rate of 600-750 seem to get an ROF of 5 (see the AK-74), while weapons with ROFs that are 700+ seem to have an ROF of 6.
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