The reason I ask is I bought a Beretta semi-auto used last year from some guy who claimed it had a box down the tube and thought he was honest since I see him around. When I really cleaned the gun I thought I had a barrel crack ...sent it into Beretta and they said it was a surface scratch nothing more. I would mail that choke tube to beretta after calling them on the 800 number and demand a new one or a whole new set of chokes for your shotgun for that matter. Unless one is using shot not designed for a particular choke tube then that (crack) shouldn't ever happen.