Wolfenstein II: The New Colossus

Contraption upgrades are done through little side missions you can go through on Eva's Hammer after you've acquired each contraption. You can get them all their respective upgrades in a single play-through.

Gamerevolution.com 's guide over which contraption is right for you also details where they all are and where their upgrades are. Be sure to check them out!
https://www.gamerevolution.com/guides/353631-wolfenstein-2-c...