I'm considering a new S&W M&P Compact 2.0 .40 S&W for a carry gun. I am leaning toward the 3.6" but I have not completely ruled out the 4". Originally I thought I wanted a S&W Shield. Does anyone know the specs comparison between a Shield in .40 and an M&P Compact 2.0? I'm looking for the grip width comparison, the height comparison and that sort of thing. I can get the overall length and weight from the S&W web site but for some reason they don't give these dimensions.