I have a three year old Beretta 687 Sporting Clays II with choke tubes that seem to loosen by themselves. I tighten them every so often when I am out on the course. The exterior smooth section of the choke tubes is about 2" long and is often dirty after shooting. I have been a bit concerned since I bought it but now I am real nervous that I am heading for trouble.

So many guns, so little time!