WarframeAlchemyLab ES
Pistol Riven Mod

Farming plan

Pistol Riven Mod

Arsenal: Pistol Riven Mod
Dropped by
Enter Nihil's Oubliette, Rotation C Uncommon 25 %
The Descendia: Uncommon Rewards (Steel Path) Rare 7.14 %
Sorties Rare 7 %
Chance of getting it by number of runs
0% 25% 50% 75% 100% 3 5 8 10 13 3 runs · 50% 3 runs · 50% 9 runs · 90% 9 runs · 90%

Each run has a 25% chance. The curve is 1−(1−p)ⁿ: there is never a guarantee, only growing confidence.