Hi there, I'm able to duplicate Gambit synths using the companion app by transferring them to myself. I attempted to move them to my vault and tapped on my hunter by mistake (I assumed the vault would be there but the vault wasn't even an option), in doing so it transferred the 2 invader synths I had to myself and added it onto itself, making 4, I tried again and it added another 2 (so it's not doubling). I tried with another synth and it worked with those too; fortunately, this doesn't seem to work for masterwork cores or enhancement shards, but I haven't tested with everything so there may be other items it works with. I was my hunter when I found this, but I imagine it would work with other classes too. > Select your character; > Open your Destiny 2 companion app; > In the companion app open your character's inventory; > Transfer a synth to the character your playing as; > Refresh the inventory (or don't, it works either way); > Repeat. Hopefully, you can replicate this.