Orginal Pißwasser :)
1. Open OpenIV
2. Go to mods>update>x64>dlcpacks>patchday10ng>dlc.rpf>x64>models>cdimages>weapons.rpf
3. Click 'Edit mode'
4. Drag and drop
5. Have Fun


Worth knowing:
https://de.wikipedia.org/wiki/K%C3%B6nig-Brauerei