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Gaunt's Ghosts storyline also has some examples of massed fire from "hot-shot" lasguns (sniping for weak points too) taking down a chaos marine in PA.

It's a hard-fought close fight but they do win through. (It was a while back that I read them, a grenade or two may have been in the mix as well.)

 Mad Doc Grotsnik wrote:
There’s definitely a difference between a Marine surviving a wound, and not being affected by a wound.

...

But being able to survive your limbs being blown off (quite common) isn’t the same as still being able to fight after horrific injuries.

...

I think part of the issue is that in some of the materials that difference isn't very apparent due to plot armors, etc.... My memory isn't what it used to be, I'm fairly certain that there are a number of examples of marines in the lore continuing to fight despite horrific injury/missing limbs (even if it's in a limited fashion - like the black knight in Monty Python). The only one that jumps right to mind is the marine in the Astartes short that loses his lower arm to the self-induced plasma pistol blast before being teleported across space and only takes a knee for like two seconds before he "alerts", stands up, and starts assessing his predicament.

I think some of the authors tend to treat it not so much as a superhuman tolerance for pain but as an absolute absence of pain. Sort of like a "pain editor" implant in Shadowrun RPG where, once switched on, your brain no longer gets any pain signals and you basically can fight until you lose consciousness from blood loss or your limbs are too damaged/missing to use.