65-80% Cleave for 5 seconds on Critical Hit.
11-14 Bleed Stacks from Special Attacks.
14-20% Damage on Second, Third and Fourth shots in a Salvo.
5-6.5% Strength for 3.5s on Close Range Kill.
I enjoy making meme builds and occasionally I strike gold, and this is one of them. It's not completely meta as you're a ammo slurping machine and if you can't be shooting, you can't be tooting.
If you don't like these weapon choices, you can use any other fast attacking weapons. Fast melee, fast shooting, lots of ammo, that's what you need for more opportunities to trigger your 10% chance brainburst.