Kraxton's 'Agile Focused Helbore' Shout Smoke
 Veteran Build - Warhammer 40k: Darktide 

Another build made to be a 'mirror' for a build over on Canary, the build in question being the 'Knife Helbore Specialist'. Initially, this build ran Infiltrate, Confirmed Kill by itself, and just kinda prayed your team was functional enough to allow you to have your 'infinite ammo fantasy' in piece. Now, I finally caved, mainly due to the discovery that Agile Engagement will trigger with a Helbore bayonet stab and boost your Ranged Damage. So now I'm just running shout just like Canary, just so I can save barely enough points to be able to run Shock Trooper, while still grabbing all the crit things + Out for Blood because having one other source of toughness regen that isn't just killing specials is VERY heavily needed on the Veteran. (if one wants a more aggressive version though, just go to Canary's Executioner Recon Lasgun and slap this Helbore onto it, it will do alright for you). 

With this set up and Armor Bane, you'll still (with crits) two shot a crusher to the dome after a mark, one shot a reaper, two shot maulers, and one shot everything else. Granted, you have to hit the head with that site, but if you're good at pin point aiming it'll be fine. Main reason I had to swap to shout though was just the ability to shove everything over and away from you when it does get to you, because it will unless an Ogryn is keeping them off you. And after doing such, you can just 'light/heavy attack into alt fire poke' to continually thin out the herd after the fact until you can comfortably go back to gunning things down again. Smoke grenade is pretty much entirely taken just because there isn't enough points to take anything else, but it can be useful when you get your toughness nuked and need to just 'hide in a cloud' away from gunners while you work back up to Iron Will toughness or wait for a shout. You can also use it to cosplay a Sniper more effectively, hiding in the smoke to dome your enemies who can't shoot back. You do want to get shot at a bit though to keep Reciprocity active, though it isn't requirrrred, just nice as it lets you wait one less second when for a free crit shot with Surgical. 

Monstrosities will also get domed pretty hard if you can hit their face, Armorbane + Focus target lets you blast your team do considerable damage to them too. So overall this is a 'support sniper' build leaning more on heavy helbore hits than a bleeding knife, using pokes to the wave to let you do considerable damage to most things for a weapon that can be shot for free. It's not like, meta or anything, but it's usable, and for a weapon like this? I feel that's quite good enough.