Hitting at least 3 enemies with an attack, increases your cleave by 140-200% for 2 seconds.
2.5-4% Bonus Critical Chance on Chained Hit. Stacks 5 times.
1-4 Burn Stack(s) on Critical Hit to a maximum of 3-12 Stack(s).
3.5-5% Critical Chance on Weak Spot Hit until your next Critical Hit. Stacks 5 times.
https://www.twitch.tv/chocolate_skull
This build works for me.
Centered around the "Shock Trooper" perk for near infinite ammo when spamming headshots.
Try to keep executioners stance up for as long as possible, hence taking "Relentless" and "Counter-Fire"
Combined with Scavenger you should never run out of ammo.
Good Luck.
(constructive criticism welcome)