The Hot Lead mission has some secret requirements to get it to spawn. I can’t tell you all of them (since we are only on day 2 of 3.6), but I can hint a bit.
- you need to have beaten the game (any difficulty ) at least 1 time.
- you have helped Kan-Ra hunt some stuff
- there is a mission that foreshadows Hot Lead, it’s been in there since launch, that must be completed.
- ? requirement not involving any missions or items or difficulty
good luck!