Flex slots are as follows you can swap out slash procs on crit aka [Hunter Munitions] for a heat mod aka [Thermite Rounds] if you like for the infinite heat scaleing and armour strip, you can also change out primary deadhead arcane for primary merciless arcane, if you like i can confirm this build can 1 to 2 shot on the heads of level 155 corrupted heavy gunners in simulacrum that is the highest level that is available to me atm as I'm only MR-25 Hope you like the build.