Can't figure out how to do gunsmith vendor challenges

[bleak orchid]

Im trying to hit rank 6, but my last quest is to talk with Banshee-44 to complete Vendor challenges but i see none when i open it, If you can help me please respond via Dm's or post comments

[dense current]

If you hover over the gunsmith from the map you should see challenge, it's to do 8 bounties. Can only do it once per character per week.