Bryce,
If steel or stainless steel is undoable for whatever reason consider this: Your Grips made from Brass or Bronze. That would add some heft to the R9 and would be a VERY interesting look for an R9 either standard or Stealth.
What do you think about any of the materials, steel, SS or Brass/Bronze?
Think about this also: Your Grips made from Silver. I personally would not be interested in Silver but I am sure others might.
My God, you already have the program written, the possibilities have me salivating(drool).
Mike