Recon lasgun at home
 Veteran Build - Warhammer 40k: Darktide 

I really don't like the recon lasgun because it's overused and boring so I basically just turned the infantry lasgun into a version of the recon lasgun which I enjoy playing with. You basically have infinite ammo, it never happened that I went below 900 in reserve even when not picking up any ammo pickups. If you want you can swap the power falchion out for any other melee weapon that you prefer. In this I used infiltrate as basically just a damage boost and suppress everything around me or to revive teammates in dicy situations but you can swap it out for whatever else, though you'd probably need to take a point out of something else too to make whatever other ability you chose work better.

Regular shooter enemies should get oneshot by a headshot and sometimes you can onehit dreg gunners (the guys wearing the yellow robes) if you get a crit headshot but otherwise gunners should go down in 2 headshots.

The extra ranged cleave node also makes the weapon be pretty good for crowd control and picking off specialists that are entombed in poxwalkers.

I'm not much of a havon player and only played with it up to Auric so I can't comment on how this build will do on there.