"You are Astra Militarum, Harry" or Almost Infinite Broomstick 2. 0 [Auric and beyond]
 Veteran Build - Warhammer 40k: Darktide 

Everything said below mostly apply to Auric diff, but it still suppose to feel comfortable on high Havoc.

Only downside of this build is how stamina hungry is it, so stamina stimm is your friend here.

Technically it's 85% crit consistent, because of 60% charge rate dump + Surgical, Deadshot and base Veteran's +10% crit, but we always can wait for another 0.6 seconds to gain 2 additional Surgical stacks to get guaranteed crit (for whatever reason).
We'll be getting 4 stacks of Surgical, but 5th one is very close in terms of time investment and you'll naturally get 5th because of human factors, like correcting your aim, switching target while ADSing, etc.

Constantly use Executioner's Stance because all breakpoints are calculated with it.
Fire Team was taken because without it we're unable to crit oneshot headshot Scab Mauler up close and in general we shouldn't have issues with ammo because of high crit and Shock Trooper.
Consistently 2 shoting Crusher with at least one crit and one half charged non crit. 
Your main way to deal with them.


For the knife, Mercy Killer and newly changed Uncanny Strike pairs extremely well with Serrated Blade and knife's punch. To utilize knife efficiently, we have to land special punch on enemy's weakspot to apply both Uncanny strike and bleed from Serrated Blade, which activates Mercy Killer on our fast follow up overhead stab attack (just press LMB after punch) and then we overhead push attack as soon as previous attack connects:

Weapon Special (Punch) > LMB Click (H1) > RMB Hold + LMB Hold (PA)
This is your backup weapon against Crushers.


Frags are for quick 3 nade dump into elite group, horde clear or CC when needed.
Don't be shy and use em whenever you can, since we running both Demolition Team and Demolition Stockpile.