I'm a gun nut, I loved LOTR and Hobbit, I don't make worlds but I do make characters and their journals will tell a "story" of sorts if you piece them together by made-up dates (it's the same as IRL dates but from 2030 upwards).
Firearm designs military military equipment designs and uses
LOTR (all three) Hobbit (all three) Maze Runner (all three) Divergent (one and two, three sucked ass)
For Honor most COD campaigns (the vanguard multiplayer gun setups hurt my brain) Ghost Recon Breakpoint, Wildlands Insurgency Sandstrom