"This map shows the locations of all the workbenches on the map DeSalle.

Workbenches can spawn:

• Blueprint - Provides 3 random unlocks (respecting unlock order) from any weapon family. Can also unlock tools/consumables before the required Bloodline Rank is reached.
  
• Gun Oil - Unlocks the next rank for the equipped weapon/tool/consumable tree or a random available unlock (respecting unlock order) if equipped weapon/tool/consumable is completed. (The second portion of this is bugged but should be fixed in the next patch)
  
• Can spawn any weapon variant (yes, even the Avto)

The spawn chance is random so do not be surprised if a bench is empty.

Compounds with multiple benches can have items spawn on multiple benches but it seems like the chance of this is lower.

EDIT: Updated with new bench in Pearl Plantation. Thanks brosader for pointing it out."