You can use the crafting station in the Base of Operations to build Weapons and other gear. You can create any items that you have blueprints for and you can obtain blueprints as Rewards from completing missions.
You will need to collect resources from locations around the city (shown as small purple icons on the map). The following resources can be found:
- Fabric
- Weapon Parts
- Tools
- Electronics
- Division Tech
or you can dismantle unwanted guns and gear from your inventory. Lower level resources (eg green) can also be traded up for higher level ones (eg blue) in the crafting menu.
One you have the resources needed for an item you can go ahead and craft it , there is no credit cost for doing so.