Don't forget to Turn on "APPLY CONDITIONALS" to see the overall DPS
I've tried to mix a lot of Mods to get to 1 Million Burst DPS but I can't find the right combination... (Unless I put Riven but for me that's like Restricting others in using this build)
if you don't know "RADIATION" is the element in this gun
"Radiation + Magnetic + Corrosive" This should be able to perform well whatever faction you're dealing with just like in [Sanctuary], so instead of putting Primed Cleanse Mods I choose mixed elements instead.
If you're worried to much about reload speed you can use Primary Merciless or you can go for Primary Deadhead because it's a Shotgun and the bullet spread can hit headshots more easily than putting Merciless which takes a lot of kill to get the max stacks.