This build requires 4 specific legendaries to work which you won’t get until end game bar some extreme luck or someone donating the items to you.
Items required:
Bloodletter class mod
Brawler Ward shield
Face-Puncher shotgun
Storm Front grenades
For skills you need
Means of Destruction x3
Torgue Cross-Promotion x5
Pull the Holy Pin x3
Vampyr x5
Armored Infantry x5
Thin Red Line x3 (you do not want 1 health with this build so don’t go past +4 with class mods, use a Deathless or Loaded Dice artifact)
Experimental Munitions x1
Desperate Measures x3
Phalanx Doctrine x5
Rest are freebie skill points, throw them anywhere you want.
What this build does is stack the Brawler melee buff due to a glitch in how Bloodletter allows the melee buff to apply even with shields active. This even stacks everytime your shields are broken. Face-Puncher then turns your stacked +300% melee buff into gun damage per pellet, allowing you to kill basically anything in the game with 1 shot.
The only times you lose your stacks is on death or when you quit, they will carry over when fast traveling or entering any loading screen.
An Ogre assault rifle is the fastest and safest way to break your shields over and over again for quick stacks, just remember that you only have to break your shields you don’t need them to fully recharge.