Punisher's 'Lone Wolf Execution Infantry' Stance
 Arbites Build - Warhammer 40k: Darktide 

Another build that would REALLY LIKE THE ASSAULT CHAIN AXE RIGHT NOW! But has to use the Combat Axe III instead, which isn't the worst, but it's the reason I'm randomly jumping over to grab the push attack cleave bonus along with Weight of the Lex in my 'Infantry Autogun V focused' build. It works well enough though, even if I would have liked the monstrosity damage, and otherwise functions as an exceptional build.

Main purpose beyond the Infantry Autogun focus was to actually use the ammo regen effect of Castigator Stance. No other weapon really needs this bonus, or even wants it, but the Infantry Autogun can get solid use out of it and feel pretty good mowing down groups of elites and specialists. To that end I focus on getting it up as much as possible with Malocator, and otherwise take crit and weakspot damage as the Infantry Autogun is pretty good with those modifiers (with them also helping the Combat Axe). I decided to also make this build use lone wolf with Shock Mines, as I didn't have enough builds that did that and so why not do it on an otherwise somewhat under powered set up? It rounds it out perfectly, brings it up to 'broken' with everything else, and lets you just dump super high powered shots into most enemy types, while Axing all the armored enemies a question when they come up. 

Push attack the wave to keep it off you, doing so repeatedly as the push attack has good cleave. This also being why I take Rapid Movement, and focus down on Walk it Off, as both together let you have a constant stream of toughness into your being as you push attack everything to death. I take Ruthless Efficiency as the Infantry Autogun's Reload is pretty quick, but having that extra 7.5% is 'just enough' to make it feel pretty dang good, and not need Judicious Efficiency at all. Everything else just increases damage and gives DR, all the best things you could possibly want, or gives more ammo so you're not AS big a tax on the teams resources. 

Feels really fun, a 'discount Veteran' with more survivability at the minor cost of damage, and a stun mine that's broken to the warp and back. If ever you feel overwhelmed, stun mine or Castigator Stance makes sure you don't. And you'll always have at least one of them up, ready to make the game a complete cake walk.