These only appear in the first section of Chapter 9. Whilst more durable than Slugga Boyz, they only wield a Slugga (the very last one you fight has a grenade), which doesn't do all that much damage unless it's sustained fire. Since you're using a Heavy Bolter for most of that section, simply aim and fire, and they should drop dead quickly.

See: Warhammer 40K Space Marine

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