Tristan - yes it does affect fully auto guns. Certain guns it doesn't mess it up too bad. Also affects using vehicles in warzone because R2 is drive. Rapid fire does have a tactical mode where you double tap triangle to turn it on and off, that is pretty handy for switching between fully auto and single shot guns. I've also started switching my guns to single burst, if it has it. Basically makes it fully auto still without messing other things up.