This was the deck I used when my 3-man completed Act 1. I exclusively used the ranch rifle and focused base/bullet DMG and weakspot DMG while they handled the healing and support perks.
Cleaner
Tags
nightmareDPSrifle
50%0 vote
Down In Front!
defense
While crouching you neither take nor deal Friendly Fire damage.
+ 10 Health
Group therapy
defense
When you use a Medical Accessory, all teammates heal for 8 Health.