Im not saying that they need to be incredibly common or in anyway guaranteed. What i am saying is that 200+ drops and not a single shiny drop is actually insane. Like i get its supposed to be rare but at this rate i wont get a single drop for half the weapons by the time the shiny drop disappears when the final shape launches. At this rate its not even worth grinding for.
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Prosperity mod on Ghost will help. Attune the weapon type you want to be dropping more which will include shiny ones. I have at least 3 of each in my inventory.