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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 (3)
Nuclear material (4)
Learned from plan/recipe
Plan: Alien blaster fusion mag
Fusion mag (1)
Craftable at any weapons workbench.
A loose mod exists in the game files but cannot be found in-game.