I bought a Patternmaster Code Black duck choke tube and had been using it the last two weeks...maybe two boxes of shells down the tube (all #2 or #3 3.5" steel shells). Well, yesterday, I disassembled my gun to clean it and found a split that runs the length of the tube. The split stops right at the stud rings. Has anyone experienced this, or know of anyone who has? Not sure what caused this, but the tube is going back to Cabela's, and am not sure I want another Code Black tube. I use/have used Rhino, Pure Gold, and Carlson's and have never had anything like this happen.