Let me rephrase my question, is there anyone who recommends a brand of magazine tube extensions. You know, the ones that allow you to hold 10 shells instead of 4 or 5. Think snow geese. Some companies who manufacture them are Sure Cycle, Nordic, Briley, etc.

Also, if you've used one of the longer ones, is it necessary to have the clamp on them to hold the barrel and the tube together?