I'm sure it's just RNG being RNG, but I figured I'd ask. After about tries, it crossed my mind that it may not even been possible to win. My friend hit moonstone jackpot in one try. They can drop anything from weapons to a live grenade depending on the result. Does anyone know if Jackpot! challenge in Concordia is broken in any way? I'm starting a new character and I cannot get this challenge even though I got. borderlands 2 borderlands: el logo del videojuego de la pre-secuela, reloj. . Man, the slots seemed much nicer in BL2, especially with Eridium jackpots. It was around october 18 Maybe it was very. borderlands 2 slot machine trick. Advertisement. Jackpot! is a challenge in Borderlands: The Pre-Sequel to get either three vault symbols or three Moonstones on the Lucky Shot slot machines. And later he got about 20 moonstones with 50 tries. I know it's probably the same RNG, but ever since I've started. Slot machines are interactive objects introduced in Borderlands 2.