Since Sentinels are usually on top of buildings in these areas, once you’ve destroyed one, keep an eye on where the turret ...
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Stop your search and look here to find Sentinels in Arc Raiders so you can nab their Firing Cores
Arc Raiders has plenty of annoying materials to track down for various upgrades, like prickly pears, olives, and mushrooms for Scrappy, but I'd argue none are more annoying than Sentinel Firing Cores.
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