Australium weapons

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Finishing a Two Cities Tour might even get you one of the most exceedingly, some might say preposterously rare items in the game: the Australium weapon. (Hushed silence. Then, from the back, a lone slow clap. Then: thunderous applause.) — Two Cities Update

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The only confirmed weapon appears to be an Australium-plated stock Sniper Rifle with a few modifications. It is unknown at this point in time whether or not these will function identically to Stock Weapons.