If your looking for a schmetic, try the www.brownells.com
site, they have schmetics, look on the right side of the main page.
Gun Parts Corp also has schmetics on their site, some of the older guns also, brownells has the newer guns for the most part.
I don't know where you would find an actual picture of a Ruger barrel not in the pistol.
If you ar removing the barrel, you are going to have to be really careful you don't tweek the frame of the pistol. They make tools that support the action when removing the barrel. If you don't want to spend the money, it may be best to have a smith remove the barrel. It's not hard to ruin a frame if you don't have the right tool.. My Best, John K