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Only difference with the KSG is it's designed to be ADS for best performance since it shoots a slug instead of pellets/buckshot.
It's literally the shotgun version of a Sniper Rifle.
If it really is the way it sounds, I will love it to death and use it forever. I've wanted a slug shotgun in CoD for years. But beta tester opinions made it sound bad, I think they said it gets way too many hitmarkers.