I have a superposed in my shop now that blew out the bottom barrel about 2-3 inches if front of the forend. No missing pieces just a big hole. I saw this gun about 12-15 years ago and it was only slightly pregnant then. I didn't think it would cause any problems so I told the owner to keep shooting it. I don't know how many rounds were fired before it blew out. Some day when I get caught up I'm going to try to repair it but first I'm going to talk to some experts about repairs. I measured the wall thickness when it came in and I think it measured a little less than .025. Pretty thin. Bill