@Koochi-Q
1)Eva shoots twice by the time the PK shoots once so the EVA can deal about 126 damage if all pellets hit while PK deals 110. Therefore, the EVA can deal a max of 504 damage before having to reload while PK can deal up to 660 damage. Also, anybody using PK knows how to use it: around a corner. So you peek + shoot, take cover, then peek + shoot again ad infinitum. Therefore, the only time the EVA will actually manage to shoot all his shots at somebody using a PK is when the PK user is stuck out in the open instead of hugging cover or a corner. Same for wingman. It's DPS is rather low but because it deals so much damage per shot, with a corner around you can do the same strat and drop people a LOT faster than any SMG, AR or LMG could because you can break the line of sight without losing DPS.
2)There is no damage drop off in the game, it's only the amount of pellets hitting that makes the damage and the PK has 11 while the EVA has 9 so your chances of landing more pellets goes with PK actually. Also, you can get the special choke, which isn't too rare, for PK that transforms it into a DMR/sniper.
3)SMGs need a severe buff because they don't even have a niche ATM. ARs, LMGs and DMRs (ie: G7 scout) are kings at medium range, so short range is about shotguns and SMGs, thing is you can unload a whole clip into somebody and, unless you have 100% accuracy or your target is AFK, you will not kill a fully shielded target where as shotguns, but even more so the PK, will effortlessly. For prowler to beat a shotgun user in CQC, the prowler needs to be equip with firing mode mod and the shotgun user need to have bad accuracy.