You will not find a method to guarantee getting 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
NO you have to get them from the mystery box. Sorry.
you cant you can only get it in world at war on the second level but you can get the thundergun on the the level "numbers"
first buy all the doors then buy te box and cook a grenade for 6.5 seconds precisly then throw it at the box
Black ops