Download link:
MapSideGunz.rar
Be sure to provide feedback on how well it works for you. I can make adjustments to this if there is unforseen issues. But in the tests I've done, my custom weapons work correctly on my IS82 map that I am working on. So I don't see any issues that any one else would run into provided they know how to add custom weapons. You'll need to provide your own gunz as none are provided here.
