Hey everybody, Looking at getting a Ruger GP100, had a couple of quick questions and in need of some advice: 1. Can the sights be changed out on these? I kind of prefer having those little "glow" rods for night sighting (one of the ranges I go to for indoor practice isn't the best in terms of lighting). 2. How often does it need to be cleaned (usually I clean my guns after every shooting, but if something comes up, then how many rounds between cleanings is recommend?) 3. The Poll I've added is whether to go 3", 4", 5", or 6". This is mostly for target/fun shooting. Possibly competition down the road, and the rare self-defense use (very unlikely, so not an important factor). Concealment also not necessary either, this probably rules out the 3" but I'd like to hear what people think would be the best. I have tried it out a few times in the 3" and I think the 4" (haven't found a place the rents the other sizes yet) so I'm trying to figure out what would be the best experience. Thanks in advance!