Guns sitting for sale with somebody’s aftermarket screw chokes are a hard pass for me. I have a gun that I had Stan Baker installed his chokes in, and the results were better than good, but, without an afternoon of shooting someone else’s attempt at same, I’m really not interested.
The most common trouble I have seen with choke tubes is people who install them and run them for ages without bothering to remove them. Then, when they try, the damn things are stuck. This problem is magnified by the use of steel shot, which peens the threads on the tube into the threads of the barrels.
Most of my choke tubes are sitting, safely, in a drawer in the gun toolbox. They have been there for years, sitting. Some have never been installed in a gun. They just sit there, waiting.
Best,
Ted