i have created a build such that i have only been hit once, and that was on room 30. it consists of chaos rounds and some other stuff that i can't remember rn.
here's the things i have that i've found out so far (including things i've changed since lvl 30):
mini-mag
extended mag- not anymore, now drum mag. never mind, bullet canister now.
chaos rounds
apparently i still had the pistol stock but now i have a snug splinter but now i have drunken stock
inflatable grip. not anymore, now i have rubber grip.
blow up trigger.