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 ...

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.

So you’ve hit that point in ARC Raiders where your starter rifle feels more like a pea shooter than a weapon. That’s when the Workshop stops being background noise and starts being survival. Crafting ...