The best mods are to upgrade the slide to one from a 1911. It won't fit on a Glock frame, so you upgrade the frame to one from a 1911. Also, don't forget to buy a 1911 match barrel. Several companies make good choises. I almost forgot, you'll also have to add-in a few small parts. Then, you'll have the ultimate Glock. (zoom, who has been waiting for a while to use this lame joke)