Price's 'Burning Judgement' FotF Flamer
 Zealot Build - Warhammer 40k: Darktide 

I rather enjoy the Flammer a lot. This build is meant to maximize it's potential. Inexorable Judgement increases weapons fire rate, but so does FotF...because reasons. Thus, combining the two lets you shoot your clip VERY fast, maximizing flame output, stacking the fire quickly, and burning everything in front of you to a crisp.

Chainaxe then comes into play, as it's one of the main weapons designed around not neeeeding attack speed the zealot has access to. You'll still likely have a good amount of it, but it doesn't require it, so even if all your buffs run out or get low it will still feel good to swing. You then run around grinding enemies to keep bloodthirsty up and keep your Enduring Faith active so you don't fall over, before you feel ready to proc Sainted Gunslinger, reload quick after a quick knife animation cancel hotswap to the flamer, and then go about nuking the whole room again. 

You are liable to run out of ammo depending on your team comp, but it's fun to pull out if you're with a bunch of Psykers or have a Survivalist.