No one will believe me, but I'm going to post anyway hoping that bungie will help. I just got a gjallarhorn doing roc strikes and I wanted to level it up using my hunter, so I was on my hunter and transferred the gjallarhorn using the app and it disappeared. I'm not lying cause I have the grimoire card and 0 kills.
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Unfortunately, Bungie does not replace lost or dismantled gear for any reason. As stated [url=https://www.bungie.net/en/Help/Article/12211]here[/url]