How difficult would it be (for a gunsmith, not yours truly ;g ) to drill and tap screwholes in a Glock slide? I know that the slides are very hard at the surface and much softer underneath, making this type of work problematic. But I've seen other, more drastic, slide modifications done, so I think it should be possible. What I have in mind is screwing a Weaver-style base to the slide so I can mount a red dot sight directly to it. Why? Because I want to try using my G37 in NRA bullseye matches and having the dot mounted directly to the slide is the best sighting system I've found, at least with 1911-style pistols. And before anyone asks... 1) Why not use a Docter sight or a JPoint? - Because bullseye shooting requires a lot of fine sight adjustments, which (as I understand it) wouldn't work well with those sights. 2) Why not use a Carver or other frame mount? - Because of the Glock's loose slide to frame fit. I know that the frame mounts work fine for the IPSC guys, but if I'm going to make this experiment work, I need to reach a higher standard of accuracy, and that means eliminating as many variables as possible. 3) Why not use iron sights? - Because I've found that I shoot better with a dot sight. Brian Zins could probably win using a Glock with iron sights but I'm no Brian Zins. 4) Why not use a 1911? - Been there, done that. I still love the 1911 but I'm really, really curious as to whether or not a .45 GAP Glock can work as a bullseye gun. 5) Won't adding weight to the slide make it too heavy? - It might. But I've seen 1911 bullseye guns cycle reliably on powder-puff loads even with half a pound of extra weight bolted to the slide. They run slowly -- with a "ker-chunk" instead of a snap -- but that's fast enough for bullseye shooting. 6) Won't the dot sight break or fall off if it's being jerked around by the slide? - That might happen with hot loads. But I'm going to be shooting soft loads with a power factor under 150 and a dot sight can last a long, long time on that kind of diet on a 1911.