After the LaW update, the scattergun texture and animations were completely changed. This reverts the materials of the scattergun back to how they were starting in 2007. My friends Chase and Pops helped me on this by fixing some parts on the vtf and vmt.
YOU NOW NEED ONE OF THE "Scattergun Shell Ejection Fix" mod for this to work.
See the Scattergun in action here: https://www.youtube.com/watch?v=w1BAmVcpWW4