Monte Carlo would probably be the best gun to pair it with.
No Back Up Plans are great! I don't think people realize it stacks with Relentless. So it gives you 25 seconds of shields, plus if you use Unbreakable it's going to regen for the time also. If you have max strength, you can use your melee every 30 seconds, so you'll only have five seconds of downtime.
i love stuff like this
don't touch me on a bladedancer in the abyss is free money but i think there a lot more weapon/armor/skill combos out there that don't get talked about. I really, really love my MIDAS/anyshotgunlol/Radiant Dance Machines on a blink blade dancer w/ quickdraw and arcbolt. Just a perfect build for PvP when you want to play a game where everyone else is in slow motion.
Saint-14 + Pocket Infinity used to be piffery when it came to chewing up mobs until the ShotgunPvE buff came along.