Modlet download: https://github.com/Jayick/Custom-Guns
The Chaingun damage value was intentionally lowered for this video, to showcase it mostly. It's damage has been adjusted to a higher value (from 2dmg to 20dmg) in the modlet download link.
Custom weapons, sounds, icons, bullets, recipes, and custom sighted values (crosshairs removed, some weapons proper sighting down the barrel).