its all about the Yellocake Launcher in combination with an Atom Balm Victory Rush (looking for a better one but its about the passives) Launcher: M10 Yellow Cake, with 200%dmg While Action Skill
Shield: Echidna Old God: +20% rad dmg
Artefact: Cutpurse Otto Idol, 40% splashradius 50% magazine size
Classmod: RedFang: 32% indirectly dmg, 26% COV firerate, 22% Radiation resistanz
Grenate: any fishslap, ASA 150% Natedmg. (Nate in use with the Cutpurse helps to restock ammo)
these are the main things to use.