Upgraded weapons (also known as "PaP'd" versions) feature specific functional changes:
: Different mods and weapon classes have varying "Penetration Values" (ranging from Low to High), determining how many zombies a single bullet can pierce. Project Lazarus | Gun Mods
Beyond the Pack-a-Punch machine, players can modify their experience through: Upgraded weapons (also known as "PaP'd" versions) feature
: The weapon is renamed and often gains a new visual appearance. Notable Weapon Modules and reserve ammunition.
: Nails stick to targets and detonate after a delay. Stacking seven nails creates a massive "super detonation".
: Significant boosts to damage, range, magazine capacity, and reserve ammunition.