You only got the quest version of the gun. You can pick it up again from Benedict.
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Thanks, was able to grab from benedict, how do I actually get it into collections?
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Edited by EckyThump: 8/29/2020 2:56:04 PMThe step you are on will upgrade the weapon into its complete form, giving it its perks, a second shot in the magazine, and unlocking it in collections. The quest will have one more step afterwards, for a weapon ornament (the catalyst is a random drop from Prestige Leviathan chests, not the quest).
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You need to progress further in the quest.