Skills to use http://bl2skills.com/gunzerker.html#525051501510500000000050505150551
You can now proc a tourge shotgun especially swordsplotion giving it OP damage especially when proced with Blockhead or Interfacer. But any gear will work even 2x Unkempt harold will work.
Gear I’m using: Evolution, legendary Beserker, Breath of the seraphs, Legendary Beserker, weapon slot 1 Twin Hornet, Weapon slot 2 Slag DVA stinger, weapon slot 3 swordsplotion, Weapon slot 4 Blockhead and Interfacer shock an Interfacer Corrosive depending on enemy.