Monotubes don’t require a barrel clamp... barrel clamps are bad because every time you take the clamp off to clean the gun and then re install it the POI of your slugs will change. Monotubes are one monolithic tube unlike extensions that reduce the chance for the follower, spring or shell to get bound up on while shooting. Monotubes are less likely Fail when dumping your shotgun into a barrel. The weakest part of a shotgun tube extension in where you thread on the extension. If that breaks your match will be done unless if you carry’s spare and the tools to get the broken hreads out. Bottom line is a RCI Monotube is the way to go if you can afford it but don’t let the hold you back from getting in the game. Shoot what you have and can afford and build upon that.