ARC Synthetic Resin is a Rare item that you can find by defeating ARCs that wander around the map. As a Rare item, don't always expect to find it on any of the smaller enemies, like the Wasps, ...
Expired Respirators are a Rare Medical item, which means you can find them in Medical looting locations throughout ARC Raiders. Not every map has a Medical location. Between those three, the Buried ...
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