WarframeAlchemyLab ES
Shotgun Barrage

Farming plan

Shotgun Barrage

Arsenal: Shotgun Barrage
Dropped by
Eidolon Hydrolyst Uncommon 22.22 %
Scrofa Shield Osprey Rare 0.74 %
Terra Attack Drone Rare 0.74 %
Terra Oxium Osprey Rare 0.74 %
Terra Shield Osprey Rare 0.74 %
Arbitration Shield Drone Rare 0.22 %
Axio Shield Osprey Rare 0.22 %
Juno Shield Osprey Rare 0.22 %
Narmer Osprey Rare 0.22 %
Narmer Sensolyst Drone Rare 0.22 %
Narmer Shield Osprey Rare 0.22 %
Orm Shield Osprey Rare 0.22 %
Chance of getting it by number of runs
0% 25% 50% 75% 100% 3 6 8 11 14 3 runs · 50% 3 runs · 50% 10 runs · 90% 10 runs · 90%

Each run has a 22.22% chance. The curve is 1−(1−p)ⁿ: there is never a guarantee, only growing confidence.