Sentinel Firing Cores are one of the resources you need to upgrade your Gunsmith in ARC Raiders. You might also need them for a quest, Trial, or some other activity. Besides, they can always be broken ...
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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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