Yes, it is possible, but you have to have extreme luck. During a fire sale, you and your friend have to go to different boxes. Sometimes, you will get the same exact weapon. If you are lucky, you will both get the thundergun.
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The Thundergun is a Wonder Weapon featured in Zombies and can also be found via an Easter egg in the campaign mission "Numbers". Quoted from the related link for Thundergun
You will not find a method to guarantee getting the Thundergun The related link has more information on the thundergun
There are two modes: one single player and the other is multiplayer. So yes, it is.
no but that would be so boss if it was real maybe in the future
there is no best class for two worlds 2 multiplayer everybody has there own unique character and there character has variety of skills and spells of which can not be put into a particular class. Your class for multiplayer is what you make it!