Krieg is one of the strongest gun user in game without much pre stacking, just behind sal. Blood bath with leg reaper 500% damage bonus. use a shotgun you have another 100% gun damage from salt the wound.
To proc blood bath is easy, just use casters, hellfire, omen, blockhead, rubi, etc. To pro STW, wear a rough rider.
Also with elem empathy, you seldom ffyl.
Axton turretless is a good choice, invest in steady, use more grenade damage boosted weapons, not torgue ok, plasma caster, omen, blockhead, rubi, bekah, etc.
No bee no bee no bee!
No dpuh no sand hawk no pimp!
Raid boss, use what is necessary lol.