No comment on mechanics and gun construction, but I do have a comment on safety. I would not ask someone to handle a gun in my house. Handling guns is when accidents happen. If someone is too stupid to carry a gun without having it go off unhandled in his holster, I would really rather not have him in my house at all. I certainly wouldn't invite him to handle a gun twice every time he visited me.

You need more friends with revolvers, anyway.