Point Recon - Martyrdom Blasting
 Zealot Build - Warhammer 40k: Darktide 

Critical hits for days on a non-Fury build sounds like a good time and it sure is once it gets rolling.  Torrent Recon Lasgun allows for huge uptime on toughness damage reduction on crit and offers precision shooter deletion when you can't close to Eviscerator range.  Opportunist and Bloodthirsty on the Eviscerator lets you one shot any non-Monstrosity from behind or from the front on weak spot hit (without Shroudfield!) once you get the special attack kill proc.  You can use the Eviscerator as a budget Illisi Force Sword with Bloodthirsty by revving it up and using light attacks for constant crits - these will one shot poxwalkers and are worse vs Groaners.  Rest of the tree is free spaces - Martyrdom is a great general purpose capstone combined with Shroudfield repositioning and ally pickup.  Build can and will go through ammo absurdly quickly if using Recon Lasgun not on shooters or Monstrosities so ask the party Gungryn first before hoovering up all the ammo. Curios are flexible - 6 wound Martyrdom with a health relic is great for general use and 7 wound Martyrdom with 250 health is plenty sustainable too.