In Arc Raiders, the Sentinel Firing Core is one of the rarest and most essential resources for progression. This rare component is not just a simple crafting material-it is the key to upgrading your Gunsmith workstation to Level 3, which unlocks powerful weapon modifications and legendary ARC Raiders BluePrints that can turn the tide of battles against the Arc invaders. Without it, you'll be locked out of late-game gear, making your raids far more challenging.

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