Call Of Duty Black Ops 4 - Zombies: 10 Tips & Tricks The Game Doesn't Tell You
2. You Can Stack Pack-A-Punch Damage Upgrades
All of the Zombies maps feature an unlockable Pack-A-Punch machine which players can use to give epic buffs and upgrades to their weapons (such as additional and more powerful ammo), after going through the requisite fetch quests to create and charge the machine, of course.
It also costs a hefty load of points to use the machine, and though you might initially assume you can only enjoy the fruits of the PAP once, you can in fact re-pack it an additional four times.
More to the point, repacking provides a 25% damage boost each time (from the base 100), which allows you to end up with double base damage after four re-packs. Despite being an extremely powerful and useful feature, it's oddly not mentioned anywhere in the game.
Granted, re-packing four times is easier said than done, but if you manage to do it, you'll have a major edge against the undead competition.