Hello, Sometimes weapons can get temporarily lost when transferring using the companion app. I myself lost a 320 Midha's Reckoning, but I found it in my vault about half an hour later. https://www.bungie.net/Mobi/en/About/Article?id=12655 Feel free to read this article about this occurrence. If, however, it does not come back, it is lost forever. Bungie does not replace lost/dismantled items. https://www.bungie.net/Mobi/en/About/Article?id=12211