How can you NOT see the problem? Look at a few of the pictures ron posted. I am not saying that your rifle/rifles are dirty in this area, if you know this chamber exists and you clean one of these guns correctly from the START its doubtful you would have any problems, But a lot of folks dont know these chambers exist? Little lone how to clean them (me being one of them) this is why i started this thread. I think it's important to know its there, and should be looked after to make sure a problem doesnt start in there! Whats to say after cleaning that you dont COMPLETELY get that area dried out and you end up leaving some moisture in there by accident? Let that moisture sit and 'stew' in there. Eventually you WILL have a problem.