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    Home»Guides»How to Unlock Gunsmith Level 3 (Sentinel Firing Core & Rusted Gear Locations) – ARC Raiders
    How to Unlock Gunsmith Level 3 (Sentinel Firing Core & Rusted Gear Locations) - ARC Raiders
    Guides

    How to Unlock Gunsmith Level 3 (Sentinel Firing Core & Rusted Gear Locations) – ARC Raiders

    By NanditaNovember 6, 2025Updated:November 20, 2025No Comments3 Mins Read
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    If you want powerful weapons and improved crafting, then you need to upgrade the Gunsmith to level 3 in ARC Raiders. For that, you will have to collect some materials such as Rusted Gears, Advanced Mechanical Components, and Sentinel Firing Cores. In this guide, we’ll go over where to find each of these items and how to unlock Gunsmith Level 3. 

    How to Unlock Gunsmith Level 3- ARC Raiders

    To upgrade your Gunsmith to level 3, you’ll need 3 Rusted Gears, 5 Advanced Mechanical Components, and 4 Sentinel Firing Cores. Once you’ve completed the upgrade, you’ll unlock the ability to craft the Arpeggio I, a powerful weapon that’s definitely worth adding to your arsenal.

    Rusted Gears

    Rusted Gears are mainly used to upgrade the Gunsmith, but you can also recycle them to receive four Metal Parts and two Mechanical Components. This rare item can be found while raiding, with the best chances of locating it in maps that contain multiple Industrial areas. The two most reliable maps for scavenging Rusted Gears in ARC Raiders are Dam Battlegrounds and Spaceport, as both offer several Industrial zones where these items often appear.

    How to Get & Use Spaceport Warehouse Key in ARC Raiders

    Advanced Mechanical Components

    There are a couple of ways to get Mechanical Components. You can get them by looting certain areas. Though each map has an area where you can find them easily. One of the most highly valued loot areas is at the checkpoint at Bluegate, but because of the bastion present here, it’s not exactly beginner-friendly.

    The Dam Battlegrounds, on the other hand, is a good option, and this area is quite beginner-friendly, so you won’t face much trouble here. A surefire way to get your hands on Mechanical Components is to refine them yourself. The refiner could be found in one of the workbenches located in Spironza’s hideout. 

    You will need 60×Metal Parts and 5×ARC Power Cells to install the refiner. Once installed, you can craft Mechanical Components using 7×Mechanical Parts and 3×Rubber Parts. The quest “Water Troubles” also rewards you with 3×Mechanical Components upon completion. 

    Sentinel Firing Cores

    The Sentinel Firing Core is a rare drop you can obtain by taking down Sentinel units, and it can be recycled into useful crafting materials such as Arc Alloys and Mechanical Components. Although the drop is not guaranteed, one of the most reliable places to farm Sentinels for this item is the Dam Battlegrounds map, where they appear more frequently than in other locations. 

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    Nandita
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    Damsel in her own distress, abodes in her imaginary world, and enchanted by the magical realms of Elden Ring. A professional overthinker who loves to weave captivating stories, and is fascinated by the art of doing nothing. When not lost in thought, paints canvases that echo her wildest daydreams!

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