You can use rapid fire but it isnt wise to use it in a GE or dark zone, Legit fire between 0-1500 is best. They watch stats a lot and as i said and others said.. cranking up your cheats in teh GE events is risky, also if you are beating them in un human sorta speak time frames.
So just be aware of that. If you want more legitish stats legit rapid fire on a gun like a lmg or high fire rate.