Getting Uncommon Gear
Once you complete the first province, you’ll unlock the workshop where you can craft gear. You get blueprints for the workshop from convoys and caches in enemy territory. That can craft uncommon gear if your base is upgraded.
Aside from that, the gear is salvaged after battle. Harder enemies, special forces, VIPs and kill teams all have the best loot. They’re more likely to show up when escalation is high in a province
If you knock out enemy pilots or concuss then you can salvage parts in that unit for a lot less of your salvage budget.