It's a 410/45Colt barrel. I've had it probably 15 years. It has a screw in choke. The barrel is rifled.
Scott
Nothing wrong with that one. I have the .357 version with the screw in choke for the hot shot cartridges. The one you have is not the one I am thinking of. If I remember correctly, around 35 years ago TC had a .410 barrel that they sold with no rifling. Until the ATF started asking why they were selling sawed off shotguns


KR