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Weapon modifications will modify an existing weapon, and any modifications previously equipped on the weapon will be destroyed, not unequipped. Loose mods cannot be crafted. For modifications unlocked through scrapping, the corresponding weapon must be scrapped in order to learn how to craft it.
Fiber optics (2)
Nuclear material (4)
Learned when scrapping object
Standard recon scope (1)
Crafted at a weapons workbench.
A loose mod exist in the game files, but cannot be found in-game.
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