I finished the campaign myself and fully upgraded a whole bunch of the weapons including: Heavy Pistols, Heavy SMG, Automatic Rifle, Burst Rifle, RPG, 'Merica Gun, 9mm Pistols, Pump Action Shotgun, Semi-auto Shotgun, and most of the alien weapons.
I go to join a friend starting a new game using my already cleared 100% game, and by time we are allowed to free roam and access Friendly Fire outside of the tutorial mission, I notice almost all of my weapons are fully downgraded or at least partially.
I am playing on the Steam version of the game, if that helps any.
Also get an error message of "DLC Mismatch" which seems to remove the Screaming Eagle vtol from my heliport as well.
I go to join a friend starting a new game using my already cleared 100% game, and by time we are allowed to free roam and access Friendly Fire outside of the tutorial mission, I notice almost all of my weapons are fully downgraded or at least partially.
I am playing on the Steam version of the game, if that helps any.
Also get an error message of "DLC Mismatch" which seems to remove the Screaming Eagle vtol from my heliport as well.