This build uses point investment and the minesweeper mod take advantage of high pellet count Jakobs weapons, namely shotguns like finger biter, Garcia, etc. This works incredibly well with the Maggie and mashers as well.
Other than the class mod this is not gear dependent. The grenades that drop from crits seem to be going off the damage dealt and the element, so buffing incendiary & accuracy with artifacts helps. Accuracy with shotguns is key to land all your pellets in a tighter spread.
The grenades dropped also seems to be healing thanks to vampyr (so no need to spam grenades unless it is a stick situation.) I look forward to feedback to optimize this them. I have used it on mayhem 3 and it does really well and it is really fun. (Be careful as the 30% reflect modifier will put you down fast).
Edit: you could put points into stainless steel bear vs. means of destruction. Once in a while MoD will proc and you don’t have to reload but auto bear aggro is nice. If you use something like the Garcia MoD will work great, but you will wont keep up time on selfless vengeance.
Guns I’m using: