How to progress objective nine of Expert Gunsmith missions?

Solution 1:

As of December 4th 2019, the tracker began working. I literally did nothing different to get it to work. This apparently was indeed a bug with this specific mission. I believe a patch from 11/22/2019 addressed this issue:

Progression/Challenges/Missions Fixes:

  • Cleaned up and updated descriptions for various challenges

  • Officer Challenge: “Heads Up”

  • “Destroy Vehicles with Launchers”

  • “Doing Work”

  • “Aggression”

  • “Expert Gunsmith”

  • “One Trick Pony”