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Weapons are Items (or, in the case of the Railgun, installation) whose primary use is to damage opponents. As items, weapons can be purchased in Barotrauma through the in-game shop (again, with the exception of the Railgun, which is in fixed position in the submarine). In addition to doing normal damage, some weapons can also cause bleeding or stunning.
Weapons can also use a different item for ammunition, which needs to be purchased separately inside the in-game store.