Thank you for all of your replies and different points of view. Even when people disagree, we can all learn something. For example, in this thread I got a picture of exactly how a scope could be mounted, and still retain my rear sight in the folded position. That was my original question. I also learned why it may not be necessary to retain the rear sight at all. I also was shown a way to have both a scope and functional iron sights in a way I had never considered. Now, I will take your information and opinions and decide what I want to do. I probably won't even get it right the first time, but at least you guys provide a wealth of information to get me pointed in the right direction, and help if I need to change course. Thanks!