I'm not sure that any of the newer weapons work for Dark Age Arsenal. What does work for sure are the weapons found in the "Playing For Keeps" Collections badge (Malfeasance, Bygones, Trust, and Bad Omens), as well as those from the Reckoning (Night Watch, Gnawing Hunger, etc.) Bygones, Trust, and Bad Omens can all be reacquired from the Drifter if you've reset your Gambit rank 1, 2, and 3 times, respectfully.
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I can try that as well. I wasn't sure if exotics would work