Oh boy this one is a mess. I hate to bring it up, but it seems to me you're only upset about the snipers, or mostly so.
Nerfing the KSG wouldn't do you any good because at most it's rarely used.
I've said it before, and I'll say it now: we have all these snipers upset about lowered rechambering rates, but why if everyone sniper has such good accuracy do you need another shot so quickly if you're shooting from long range?