Gun Psyker CARRIES me in Karnak Twins Hard Mode | Darktide

Nice gameplay, any clue what their build was?

Strangely, this build works BETTER in hardmode because they're aren't any scab/dreg bruisers or shooters in the standard difficulties lol.

Psyker build:
MkIV duelling sword with uncanny strike
Columnus V infantry autogun with dumdum
Scriers gaze and disrupt destiny