I've known a couple people who beat the mission but didn't get the weapon, so I think it might not be a 100% drop rate.
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I ran 3 teams through it last night and got a total of 6 people there Whisper - so I believe it is intended to be a 100% drop rate. 1st run, 3 completed, 3 got whisper 2nd run, 2 had whisper, 1 needed it...it dropped for him when we beat it 3rd run, 1 had whisper, 2 needed it, it dropped for both of them when we beat it.
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Whoever told you that is lying! If you kill all 3 bosses at the end The Whisper is a guaranteed drop.
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It didn't drop for a dude in my fireteam. He had to run it again.
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He must’ve already beaten it on that character then. I’ve run it for several ppl on my friends list and you’re the first person I’ve heard say it didn’t drop.
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He claimed that wasn't the case, he hadn't gotten the gun on any of his characters Not sure what he stood to gain by lying either. Maybe it just glitched.