Interesting. What comes to my mind are the now discontinued Uncle Mike's boot grips for the SP101 which give the little revolver a sort-of "birdshead" look and feel. They address the one shortcoming of the excellent factory grips by rounding and narrowing the butt of the pistol without adding a lot of extra length. Similar grips are, I believe, available in hardwood from other manufacturers, though I haven't sought them out. I'm not sure I would buy one since I'm a bit SP heavy but rather like the idea.