IT'S TOO SLOW, THEY SAID. IT'LL NEVER WORK! THEY SAID. Well guess what, it fucking works. The dual LBX10s pump out mad DPS and even with the MPL the whole setup is cool enough to run nonstop in the center of Caustic. You can twist if you want, but I just wiggle while holding down the LBX AUTOSPAM button making sure to time it so, you know, the spreadshot actually goes where you want it to. It actually plays like a 2xLBX10 Marauder, right down to the speed. But people pay you less attention since you're 20 tons lighter and that, is a beautiful thing. Oh, and make sure you take both ballistic magazine skills, cuz you'll need them.
I still think you're mad. here's one with more than enough ammo to last a trigger happy player and some rockety bois that arguably will deal more damage than the single MPL over the course of the game, with full slot usage to boot and/or it can go a bit faster: