Headshots chain together a larger amount of zombies, so… aim for the head. Operator Mods are an attachment variation available in Call of Duty: Black Ops 4. All survivors have HUD icons, lobby icons, incapacitated icons, and first-person arms. Although plenty of eyes seem to be on the title's battle royale mode, Blackout, the traditional UGX-Mods.
If you have nazi_zombie_MAPNAME_patch in the mod folder you compile, delete it.