to those complaining about the gun lvl affecting the zombies lvl i didnt see a problem with it if you knew how to upgrade your gun properly. like starting with reload instead of dmg so you can get more shots off faster thus making the dmg factor null for the most part and then working on melee dmg. i found it an easy game over all
once i got reload upgrade 11 and the perk for the assultrifles my famas stoped reloading and would only have 1 clip would like if i could use the gun more than that :(