From Guild Wars 2 Wiki
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Chaos Gun is an exotic level 80 pistol and the precursor weapon for Quip.“
— In-game description
Rare chance from the following sources:
- Drop from foes throughout the world.
- Drop from any container that can drop random exotic weapons.
- Mystic Forge: chance when combining four rare or exotic pieces of equipment with an average level of 75 or higher, e.g. one L60 weapon + three L80 weapons or three L75 pieces of armor and a L75 weapon.
- Found in various chests:
- Reward from guild missions.