I like GP100's a little bit, last I checked I have about 15 of them

In various "flavors", fixed sight, full lug, half lug, .357, .327, .38.........can't wait for the .22 to come out. They are the "set it and forget it" revolver, especially the stainless models. You load them, shoot them, clean them, that's it. They require 0 real maintenance, no retiming, strain screws mushrooming, yoke screws wearing out, etc. You just use them and they work. I know people who haven't taken them apart to clean in 20 years, some that hardly clean them, they will still work when needed.
They did indeed make them with a half lug barrel, like my .38 pictured above. I have identical GP's in stainless. Ruger used to make a 6" half lug with adjustable sights, I had one but it was a beater. I sold it off and need to find another one. I don't know why they never made a 4" half lug with target sights (besides the Match Champion).
My 6" half lug GP was perfect with compact Letts on it, it was just abused by a past owner. Would like to find one in stainless.