Howdy Picture is worth 1000 words department. I just grabbed a bunch of N frame Smiths and took a close look where the rear sight screw is. It is not directly over the barrel/cylinder gap, it is a bit closer to the frame. Here is my Model 27. Notice where the screw is, without getting my calipers out I would say the screw hole is centered about halfway along the amount of barrel extending in from the frame. Yes, it could use a good cleaning, don't give me any grief about that. From this view the front sight screw is completely hidden by the barrel extension. Yes, there is a little bit of flame cutting, but this Model 27 left the factory in 1959, so a little bit of flame cutting is to be expected. Anyway, I don't see any evidence of any problem caused by the screw hole. If a little bit of soot gets blasted onto the circumference of the cylinder, so what? Yes, the soot is more noticeable on a stainless revolver than on a blued revolver because the soot is dark. By the way, any soot deposited on the circumference of the cylinder is easy to wipe off with a cloth soaked in Hoppes #9. Nothing abrasive is needed. Not like the carbon rings that get blasted onto the front face of the cylinder, they are more difficult to remove, which is why I never bother. Here is why a Model 27 weighs more than a Model 19. K frame Model 19-3 on the left, N frame Model 27 on the right. The cylinder is bigger, so the frame has to be bigger to accommodate the bigger cylinder. My six inch Model 27 weighs 3 pounds 1 ounce unloaded. The next time I have my six inch Model 19 out I will weigh it and let you know what it weighs.