@ARC-TAN is a 
Torgue Shotgun
No Elemental Type
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How to Unlock The Legendary ARC-TAN
Weapons
Legendary Loot
Overview
How to Unlock
Unlock Location:
- Activate The Vault x Hunter, Vault Card and Progress through "The Legend of the Stone Demon" DLC.
- Earn Points by completing challenges and leveling up.
- Once you have got enough points you will are able to purchase the @ARC-TAN form the Vault Card.