KSG and M4 serve different purposes really, they'll be all poked at eventually to find the right balance. KSG is close quarters, you're meant to make all the bullets hit to make it count properly
The way I changed KSG, it's worse than its PBP counterpart while still not being made completely redundant by comparison to other SHOTGUNS, so stop comparing it to M4's and such, pretty sure its not really a sparring weapon x.X