Need help with Bandit (guns) Krieg challenge run

I'm doing a personal challenge of doing Bandit Krieg but only the weapons since I'm not skillfull enough to do a full bandit only run with only bandit grenades, class mods, shields etc

I was doing melee Krieg for normal and TVHM but in UVHM I gotta use that one skill where I hit myself to do damage but it's really just a gamble of whether or not I'll kill the enemy or myself which is annoying

I wanna try the red tree since I already do green. Blue is fun but I'm not sure if it's viable anymore. Also any gear that could be reccomended for this run I can farm or get through quests? For guns it can only be Bandit but everything else is fair game