Petanque is a 
Order Sniper
Its special effect is Clonk - On kill, attached projectiles jump to a nearby target.
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How to Unlock The Legendary Petanque Order Sniper Rifle
Weapons
Legendary Loot
Overview
How To Unlock
Unlock Location:
- Progress through the (FL4k and the Last Resort) DLC until reaching the Boss
Jayson And His Frame
Farm Method:
- Defeat Jayson And His Frame to get a chance at the Petanque.
- After use the Encore Machine nearby to reset the fight.
- Repeatedly defeat Jayson And His Frame until the Petanque drops.