Here are the drops in Coop Maps that I know as of right now.
These maps must be in hard mode in order to get the same drops as I listed below.
If you know of other drops on the maps that I listed below, comment below and I will add it to the list.
If you know the other drops for the maps that I didn't list, then comment below as well so I can add to the list.
Slate hill- Snipers
Outfox1- Accessories/Vampire parts
Outfox2- Pistols/Stolz black ops/Stolz stormer/Infected Zombie/CWC Guard Grand
Trap- Shotguns/Host Zombie/DEDT
Chris Revenge- Rockets/Hulk Zombie/ROC Flamework?(not confirmed)
Buckeye Vate- Rifles/Clammy Zombie
Having trouble completing buckeye and Chris? Grab a few close friends that doesn't cry everytime, friends that doesn't rage at anything and have alot of tokens to SSP the living -_- out of the Map Boss.