@Roulette is a 
Order Pistol.
@Roulette Has a Trait that give the player a Random buff on Reload.
Can be found in the Elements: None
Use your favourite features in-game with our Desktop AppBorderlands 4 Guide
How to Unlock The Legendary Roulette
Weapons
Legendary Loot
Overview
How to Unlock
Unlock Location:
- Progress through the "Legend of the Stone Demon" DLC until reaching the most East area of Demon's Domain.
- where you will encounter the Boss "Bore-Tex".
Farm Method:
- Defeat Bore-Tex.
- After use the Encore Machine nearby to reset the fight.
- Repeatedly defeat "Bore-Tex" until @Roulette drops.