This isn't the worst case of hit registration or armour system, but it's very broken, as, shown in this clip, TheRunningManZ lands a headshot on this survivor, with a CR75 and one 9MM bullet, and he doesn't take much or any damage at all after being shot in the head!!
He had a camouflage boonie hat on, and lived from a 9mm round to, presumably the brain, and lived and was able to run.
It didn't even look as he was injured or limping like he didn't get shot at all.
Headshot people, with pistols in specific.
Try different headgear/armours (helmets, boonie hats, head torches, etc.)
unless this is intentional, which should not be the case, as even .380, 9mm, .45ACP rounds should all instantly kill someone, when shot in the brain
I also saw when LIRIK was playing DayZ, he didn't kill someone when he shot him in the head (stable patch)
He was at NWAF, and the person had a headtorch on
and he survived a headshot from an .380 round from a Makarov IJ70 (shown in video clip, watch at .25x speed)
His friend finishes him off.
https://clips.twitch.tv/DeliciousAgitatedPenguinTF2John
Also, after he dies, his death animation glitches him through the wall, to the north outside the building. fix collsion?