There is a guy on INGO that will thread your barrel for $70 IIRC He is in the INDY area. I'm sure if you start a thread in the long guns section with the title need barrel threaded he will find you.I own a tactical Remington 870, but would like to have a breech added to the end of the barrel. There is no choke on the end of the barrel. Is there a breech available that will fit? Thanks for your input.