I just got my Ruger Old Model Blackhawk back after being stolen some 16 years ago. The only problem was when I went to retrieve my pistol the cylinder was missing and they could not find it any where in the evidence holding room. After a long search at gun shows and online I finally found one. The cylinder is in really nice condition, fits my pistol well and lines up with the bore of the barrel nicely. On the front of the cylinder is the letter S. I was told that the letter on the front of the cylinder applies to certain serial numbers of the pistol it was manufactured for. I want to make sure that this cylinder is indeed for my pistol before I fire it. Can any of the members give me any advice on my concerns? Thanks, gbob