Ogryn
5-8% toughness on Chained Hit.
5-8% Strength for 4.5s on Kill. Stacks 5 times.
2-5 bullets loaded from Reserve on Critical Hit.
5-8% Strength for every 10% of magazine spent during continuous fire. Stacks 5 times.
This is the gunlugger build I've settled on for running auric damnation.
This will be overshadowed in short term DPS by Achlys stubber builds in lower difficulties; the name of the game here is shoot forever and rip through an oversized pack of crushers or clear a dozen scab gunners.
Can be a bit of a glass cannon if you aren't careful and let things sneak up on you. Use the knife to clear hordes and make room. The new Karsolas Pickaxe or the MkIIIb Bully Club are great alternatives.
Not recommended if running with braced autogun vets or other gunluggers that will need large amount of ammo, but nothing with clear the field like this build. I always come back to it.
Extended Weapon Customization mod + plugins to make your gun look more like an autocannon recommended but not required.