My New Englanders, the choke screws into the barrel. Not on the outside of the barrel. Mine is factory and I think the choke is modified, but will not swear to it. Its a grouse killer. Why would you want the barrel to choke inside? I have to take the choke out, just to reload. Its a PITA. Otherwise its hard to force the shot wad cup past the choke. I have a special tool I carry to screw the choke up enough to where I can then turn it with my fingers. I always thought they should have put the choke on the outside of the barrel, so that no tool was needed to remove it.