Now I need some opinions. So I did a little research, and Meprolight got more votes than the other brands. Just got the Tru Dots from Amazon, along with a front sight retaining screw wrench. Want to put them on the G19 Gen4. No issues with the directions for the front sight install, except I never heard of Loctite 609. Used the blue and the red lots, but never heard of 609. Is it even available locally I wonder. So the directions say to sand or stone or file the rear sight down to the point where it can be pushed in with finger pressure, and then glue it with this Loctite 609. Man, do I ever hate that idea! Point of impact can move for lots of reasons. Wear on certain parts, decide to use different ammo, etc. Loctite will soften with heat, but if I put a heat gun on it I'll probably damage something in the sights. Or will I? So I watch a couple of Youtube videos. One guy does it by the book, after sighting in the pistol and carefully marking the center points of both sights and where they align on the slide. Another guy taps the Mep rear sight in with a plastic mallet. Another guy uses a sight installing tool. One guy used blue Loctite, another used red. I have both on hand. Anyone here put these sights on themselves? What do you think? I think I'd rather keep the Glock sights on there than glue the Meps in so they can never be moved. Glock sights don't glow in the dark, but they are easy to drift. Maybe as a compromise fit them a little tight and use blue Loctite?