Rogue Chocolate Stout Ingredients

I just popped open a bomber of Rouge's Chocolate Stout and noticed that on the side of the bottle it list the ingredients.

It reads:
"10 ingredients: Northwest Harrington & Klages, Crystal 135-165 and Beeston Chocolate Malts, Cascade Hops, Rolled Oats and Roasted Barley, Natural Chocolate Flavoring, Free Range Coastal Waters & Top Fermenting Pacman Yeast. No Chemicals or Perservatives"

Anyone tried making a clone of this? I absolutely love this stuff.

I had toyed around with the idea. I thought it would be cool to make a chocolate oatmeal stout.