README:

This skin is to be downloaded manually, and requires ULTRASKINS-GC to run.

Instructions:

Extract this mod's ZIP file somewhere.
go to %APPDATA%\bobthecorn2000\ULTRAKILL\ultraskinsGC and create a New Folder with whatever name you want (e.g: My Skins).
Drag and drop all of the files from the extracted ZIP (except for README.md, manifest.json, and icon.png) into this new folder.
Boot up the game with ULTRASKINS-GC loaded.
Open up the US menu next to Settings.
Select the new folder to load its contents into the game as your new skin(s) ingame.

Screenshots:

About this "skin":

This is the unused 256px version of the Slab Revolver, seemingly the one that came before the current 128px texture that is used ingame. I have touched it up a bit so that it'll work with Ultrakill's emissive color pipeline, and also made a custom ID Colormap texture that will work with your Custom Colors.

Special thanks to:

747shove's post about this skin letting me find out about its existence... two months after it was found.

Syla (tetriscat) for ripping the textures for me.

want to make your own ultraskin? go to my skin template repo