A slight change at Swingpoynt's deck.
You can find the original idea here : https://www.youtube.com/watch?v=8ttBh07PPWk&t=344s
Basically shotguns are super good with shredder because they fire a ton of pellet that will apply the shredder effect. If on top of that you pick an AA12 which has a fast rate of fire, you can almost permanently apply the shredder effect for you and your team.
I'm playing Weapon Scavenger to find more consistently an AA12.
Also with 100% accuracy and buckshot bruiser you can potentially stack really fast temp health on mutations.
Needs more testing, maybe needs 1 more ammo card because the AA12 is really not ammo efficient. Otherwhise you can pick a Tac14.