|Damage Type||Explosive Radiation|
|Ammo Type||Mini Nuke|
The Fat Man fires Mini Nukes, a rare and expensive ammo that deal a lot of damage. The Fat Man catapults or 'throws' the mini nuke towards an enemy.. The blast radius of the gun is large, and the Fat Man fires at a downward trajectory, so use caution when firing. The area where the Fat Man hit will be irradiated for a short amount of time.
There is a unique Fat Man in Fallout 3 named the Experimental MIRV which fires eight Mini Nukes in one shot; the player can acquire it at the National Guard Depot. It is the only weapon more powerful than the Fat Man.