Hey, hopefully you're still giving support for this script, because it's exactly what I need for my game, since there's only 4 weapons in total; I'd rather have them upgrade than make new ones altogether.
I couldn't get it working, so tested it on a new project and it worked fine. Then I added each of my other scripts one by one to find the compability issue and it kept working, but as soon as I change something (I've no idea what) in the database it keeps pulling up an error; I've no idea where I'm going wrong, as I can't think how the database would have an effect.