Weapons of POSTAL 2 CORKSCREW RULES that released by Akella as Add-on or standalone package. I modified those weapons slightly
how to install
unzip the archive and put the corresponding files in the modloader folder
The compressed folder called source unzips it and a folder will appear with the name of the mod, enter and choose the version of the mod that they want or that works for them once that is done, they create a new one in the modloader folder with the name of the mod that in this case is "TubeWeapons" inside this put the folder you selected and change the name to Classes and that's it.
how to use
Launch Postal2 and select NewGame --> Workshop... --> select the tab "Mods" and double click "TubeWeapons" to add the game