ok take a full auto shoty add it with -extended mag -SLUG -1x optic basicly its a steroid AR with insane dps if you know how to use it right and aim for the head,best used on heavy since shield will help you out in cqc,the only downside of using it is low ammo capacity,expect 1 or 2 kill per mag,and bring ammo bandolier if your having a problem with this dont believe me ? only one way to find out......
I use that all the time Two at once, in fact Strapped to the arms of my walking tank #SLUGLYFE 4real though I'd recommend it with the quick reload, more accurate one (aka the free one) as it's a much more suitable gun for slugs.
I know 2 people who did that: Me - sucks with it, cant get a single shot on target. Anotherguy - Kills me every time with it.
I used to do that with the semi auto shotty and it was better than the battle rifle ever was. This was before they nerfed VS slugs and gave them crazy bullet drop.