I know this post will go into the void cause I highly doubt Bungie reads any of this. If you get a rare -blam!- shiny weapon to drop it should always be adept. Double RNG on something already extremely rare makes no sense imo.
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Idk why they made another weapon list of weapons with 4 individual iterations again. Just make 2-3 a normal and adept shiny that's it all it did was unnecessary inflated the loot pool more.