Rusty Ruger
According to Ruger employee's I've visited with at the Shot Show, Ruger doesn't only do castings for themselves, they cast for many other firearms manufacturing companies. And the Shot Show has a display showing some of their castings. I own 21 Single Action Rugers, and several of their semi auto 22's, but no big bore semi auto's made by Ruger. Of the single actions, I have two stainless steel ROA and one which is blued. I have conversion cylinders for all three guns, and have used both SS guns with the cylinders, but not the blued model. I've owned these guns since 1984 and no pitting is apparent of any of them.