I zipped up the old Pre-v1 weapon models for the grenade launcher, the shotgun and the ion cannon.
http://zero-flame.com/download.php?view.37
There are some problems with the models in-game though. The Ion Cannon Model dissapears after shooting, so you will have to switch to another weapon then switchback to get it to re-appear. I don't know why it happens. Also the Shotgun reload animation won't play if you have wired reflexes, but it will still reload.
To install simply extract the contents of the zip files into your "Steam/Steamapps/username/Dystopia/Dystopia" file directory.