I noticed when I was playing PVE Exile servers that AI HMG gunners were invincible. So I set up a mission in the editor with an OPFOR AI raised HMG and I'd try to kill him from behind.

When the BB Raptors Zombies mod is enable I am unable to kill the HMG unless I use leg shots.

I've uninstalled the mod, reinstalled. Validated my ARMA folder
Problem still persists.

https://youtu.be/FQb_rgn89Aw