Images:

gw2-chaos-gun-pistol-1gw2-chaos-gun-pistol-2gw2-chaos-gun-pistol-3

Set:

The pistol Lyss/Ilya shares the same skin

Slot Item Name Trading Post Preview Code
Pistol http://db.dulfy.net/item/29174 GW2 TP [&AgH2cQAA]

Where to Obtain:

Chaos Gun: Randomly obtained via Mystic Forge/chests/drops etc (Precursor for Quip)
Lyss: 1x Eldritch Scroll, 50 Mystic Coin, 250 Glob of Ectoplasm, 250 Orichalcum Pistol Barrel
Ilya: 1x Eldritch Scroll, 50 Mystic Coin, 250 Glob of Ectoplasm, 250 Ancient Pistol Frame

Particle Effects:

Pink-purple mists