Add a secondary firing mode, for example rattlers can have a precision or a splitfire secondary mode and you can toggle between these using 'X' (on pc) and you can add specific boosts and downgrades like for rattlers precision mode extends the barrel but significantly decreases the firerate and the dmg stays the same as 1 bullet, you can even make it so that it only fires in bursts like that and has higher recoil cause it would be too much like the carbines or ARs if you didn't lmao