Killing Space Marine Heroes as Imperial Guard

[Bunston]

What units do the IG have that effectively deal with Space Marine heroes? I went for a mech build and even with the increase penetration researches and added bolters the tanks felt very ineffective at killing the heroes.

[Jey]

Ratlings are ok.
Infantry with a Commissar is ok.

The use of psykers (+50% damage with Misfortune) is recommended.

[DasaKamov]

Primaris Psyker's Molten Beam
Ratlings (as mentioned above)
Heavy Weapons teams with Krak Missiles
Tempestus Scions with "Hotshot Power Pack" upgrade
Wyrdvane Psykers' "Misfortune" ability (as mentioned above)
Bullgryns
Thunderbolt Fighters
Marauder Bombers

[Grotzel]

Really many heroic guardsmen! The answer to everything.

[Bunston]

Ha, so basically almost anything but what I tried to use XD. I assumed the lascannons on the tanks would do the trick, but I was wrong. Thanks.

[TemplarGR]

Ofcourse the lascannons would do the trick. You just need more of them. Space Marines heroes are extremely tanky, as they should be. You shouldn't expect to just bring them down with a couple of shots.

[Etrusco]

Where you using awaken the machine spirit and Tank Commander?