This is one of my old PPC guns from the "days dinosaurs roamed the earth"....mid 70's. On a model 10 frame...... Bo-mar rib, 1" round barrel with 10 l&g that was made by Apex I believe. (not sure about the barrel manuf) An Aristocrat counterweight was added later. The one I used in most of the matches had a spurless hammer and a bumpered trigger stop. (da only)
Ended up adding the plating because of the problem with oxidation.
I built several of these on various S&W frames for our officers who shot on the various pistol teams in the area.....and a few for locals.