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SFS Standard Secondary Armaments Item 0

Source Tech Core pg. 186
Usage installed in a gunnery
You can install a second weapon in the gunnery. You can select one active weapon at a time, which counts as your gunnery weapon. You choose which weapon is active when you start helming the gunnery. You can switch your active weapon as an Interact action, which is a station action with the manipulate trait, while helming the gunnery.