I am looking for some 12ga choke tubes for a CZ shotgun. The only one I have is a imp. cyl. I would like to have a mod. & a skeet. I think they will interchange with some of the Beretta, Franchi, Benelli, and possibly Stoeger tubes. The threads come all the way to the end of the tube like the others mentioned. I do not care if they are flush tubes or extended so long as they fit properly. If anyone has any of these for sale call me at (270) 432-2547. Leave a message if no answer. Thanks.