So I just went for it and the mag mod worked out great. Tedious couple of hours with a dremel and a file but worth it. You have to shave like a 1/4" all the way around and you lose the thumb feed pull. I have my gsg mp40 9mm mag loader that will work, it's more of a show mag anyways.
Here are pics
http://imgur.com/gallery/BCUEuQJ
Here is the post that I followed on how to modify an airsoft metal mag.