For the ones who uses from Pinki Winki, you notice that it allow us to manually insert the item codes in and freeze them.
Edit: The idea of using the same code for different account has been busted, sadly. But there is another idea i got from this manually putting in item codes: You can overlap them! Copy and paste the same code over different weapon slots, and you have the same weapon, just in different slots!
I have confirmed that this work.
This, however, is very easy to be noticed, since people can just look at your weapons in waiting room, or seeing you switching out the same weapon. =/