2075年6月，史特朗堡的指挥官布罗克将军，负责M42投射器和测试刚生产的一批T-51B动力装甲，并把成员分成两队，同时进行两项计划。The team in charge of the launcher first attempted to lower the weight of the warhead, and later tried to increase the power behind the firing mechanism, but both designs failed to produce satisfactory results. In both scenarios, 它的杀伤半径超过了它的射程，搞死那些士兵in the blast or soaking them in lethal levels of radiation.
After almost two years, 历经数次挫折，甚至损失了一支测试小队，the engineers behind the project 将fusion sub-charge内建于弹头里，大大的增加射程。 2077年9月，发射器被运到了密西西比，and from there to the Chinese front.
The M42 Fat Man is an effective mortar/artillery weapon, allowing a person to bombard a large area with good precision and deadly force. 使用迷你核弹发射，爆炸影响的区域会有辐射性。
Although highly similar to the Fat Man, 实验型MIRV一次发射8颗迷你核弹，成为一款极具破坏力and with a bigger blast radius的武器。
以斯帖是特殊版的胖子发射器。with a different rear mechanism,炮身涂成了淡蓝色，前端还自带一块防爆盾，容纳核弹的沟槽是透明的加厚玻璃或是塑料。比普通版重10磅，but does not jam, and is more powerful.
The Striker was made by the employees of Beaver Creek Lanes for Thomas Davis, a former league champion that became handicapped after a battle injury. The Striker was meant to serve as a tool for Davis to launch bowling balls even though he had lost use his legs. It doesn't launch nukes but modified bowling balls.
This unique Fat Man was hidden by John-Caleb Bradberton, the inventor of Nuka-Cola in Nuka-World. Instead of regular mini nukes it launches Nuka-nukes, a specially modified, quantum-enhanced version with increased explosive power.