Model 1000S ported barrel

[markmathes]

Over the weekend I bought this gun at auction. The gun belonged to a national skeet shooting champion. The end of the barrel is ported and enlarged. It has an IC choke in it that is 3.75 inches long. Can anyone help me with info? What type of chokes does it take?

 

[markmathes]

Here's a pic of the end of the barrel

 

[s&wchad]

I believe that was originally a Super Skeet with a fixed choke (Tula). I think they were made to shoot paper shells without a shot cup.

It appears someone had it modified to accept choke tubes. I wouldn't have thought it possible, but if anyone could it would be Briley.