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The Pack A Punch is sick.
I do not know all of the 15 upgrades (srry)
The Known upgrades are
PPSh-it turns into the reaper. It has 700 bullet capacity plus a larger clip plus more damage plus it fires faster.
Ray Gun- No more blowing off their arm it is a auto one hit kill. It also fires red now. The best part is you can't kill yourself with it. It also has a bigger clip the name is now Peters R2 Raygun (or something like that.)
Browning- bigger clip holds 700 shots, more damage fires faster.
MG-42 - same thing as the browning
Kar-this will be one of the better guns you can upgrade. Supposedly it turns it into a sub-machine gun but it holds a lot more ammo. Also fires red
WunderWaffle - it has a bigger clip, stores more ammo, it has a bigger radius, and can transfer to as many zombies as it can reach.
FlameThrower- more damage shots the flame farther and shoots for longer and recharges faster.
M1A1- not 100% but more damage, bigger clip, fires pink and i think rapid fire.
Shotguns- explosive shells
This is all i know i will update it when i know more of the names.