This gun just won't drop for me. Nothing i do is apparently good enough for it to drop.
I set my modifiers so that my score was forecast as A. I struggled through and finished with 26:34 left before the timer ran out.
Then for some reason it gave me a B+. No Choir of One drop still.
The exotics missions need fixing. The exotic should drop on first completion. Always. The catalysts should be tied to the chests and puzzles. The only thing score should affect is the portal gear drops.
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Update - After repeated trying, i finally got it to drop. I had to make sure that the projected score wasn't just A but over A by a large margin. It also only dropped when I got a run under 30 minutes. Which isn't stated anywhere in game. The timer you get is over an hour. One huge issue will be that the solstice modifiers boosting my score would've been a big help. The moment those modifiers go away. You need another negative modifier to compensate. I stand by my statement that it should always drop on first completion and the catalysts be tied to the chests and puzzles within the mission. Not using those is depriving new players of the intended experience of the exotic missions.