I kept my Stillpiercer (love it to death), but I agree; anything that you can only get once per play through should be either available at a kiosk or from a vendor.
They did it with the legendary swords (Shaxx sells them), so they should do the same with Stillpiercer /Sussano/Imobius at the gunsmith or at a kiosk.
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Maybe ikora, cayde and Titan vanguard dude should offer them after they are awarded
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My point exactly!!! They did it with swords which means they could do it for other items.