I was doing the quest for the different powerful weapons to unlock Niobe Labs, I noticed my powerful sniper frame disappeared. I need the sniper in order to open it, it would be great if I could get help!
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The only way to re-acquire weapon frames that are no longer in your inventory is to buy them back from Ada. Ada offers three frames every week, her frame stock refreshes on the weekly reset on Tuesdays. So if she doesn't have the frame you're looking for, check back next Tuesday.