READ IF YOU WANT WINGMAN NERFED

Game is called apex legends, not csgo legends, not bf legends. Balance from other game does't matter. Ok if you so wanted to use balance form csgo; R8 Revolver requires arming - wingman need same.
In apex legends wingman and peacekeeper are dominating above all other weapons. It's not a question about those 2 weapons. 

Full body shot form peacekeeper 110, for deal same dmg from 99 u need to hit ~10 ammo: it's 1/2 from default magazine, 1/3 tier 3 magazine. At the same time peacekeeper still have 5/6. At the same time 99 requested tracking and prediction, while peacekeeper don't request hard aiming. Let's compare wingman and g-7. So g-7 is a sniper rifle, with hard bullet drop, many slots for mods (weapon definitely needs them all). And g-7 have body shot dps 136 against 153. Also head shots: 60 against 90. Pretty same magazine bodyshot dmg per magazine 300 against 270. What reason to use g-7 and collect mods if u get wingman?

Yes there is no need to hard nerf peacekeeper and wingman. But balance changing by decrease magazine sizes, lower bullet speed or harder bullet drop are needed.