get a thundergun on the numbers mission
as soon as the mission starts blow up all the nova 6 containers then turn around and go benind the shelf thing, there should be a cassette player hold X at this and you should have the tape, continue with the mission untill the jump into the room, there sould be a cassete player here too, hold X at this and you should hear beeping, wait and the screen will shake, then the thundergun comes out the wall, hope this helps
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