The Fat Man is one of Fallout 4's more fun if impractical weapons. Very loosely inspired by the real-world Davy Crockett nuclear recoilless rifle, The Fat Man atomic catapult deals 450 points of damage in a wide area, and only the Minutemen artillery barrages match it in sheer destructive potential. However, Fallout 4's Fat Man also has limitations and can be just as deadly to the user if players aren't careful.