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Chapter 9: Starships / Refitting and Upgrading Starships

Refitting Systems

Source Starfinder Core Rulebook pg. 305
If the PCs want to alter their starship before receiving additional Build Points (for instance, replacing a weapon with one that costs fewer Build Points or consumes less PCU), they can do so at a friendly spaceport (or safe landing zone) given enough time. If they replace a system or option with one that costs fewer Build Points, they can immediately spend the excess Build Points. Refitting a single system or starship weapon usually takes 1d4 days.

Archives of Nethys

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Refitting Systems