by using the mystery box and getting lucky
Only in zombies.
by going to the random box in zombies
You can get it in the mystery box in Zombies.
you don't it is random
you get it from the random weapon box by luck.
luck
you can't get it in multiplayer. you can only get it in zombies through the mystery box.
There is not a glitch for the Thunder Gun
ak74u
PISTOL
The Ray gun or the Thunder gun. ( However it also depends on the map, like in Call of the Dead instead of the Thunder gun its the VR-11, for the map Five it's the Winters Howl.) Hope this helps.
from the random box