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Wheelgun is the title of a group of common pistols in Borderlands 2 exclusively of blue rarity. They are manufactured by Jakobs, and use the Bandit, Dahl, Maliwan or Tediore barrels. Depending on the rarity, this title seems to be interchangeable with Revolver, which is valid for all the same barrels.
Usage & Description
Like it's more common counterpart, the Revolver, this weapon is identical to that one but with the silver and red skin typical of blue-rarity weapons with Jakobs. Like any other Jakobs revolver, fires as fast as one can pull the trigger.
Unlike the more common versions of the Revolver, this gun has a better chance to spawn with attachments to it that enhance its stats.