Call this number today and talk with Dean Harris, in OK. He's a very knowledgeable barrel man, and an easy to talk to straight shooter. I wouldn't question anything he has to say about shotgun barrels and chokes.
Most of us "gun nuts" have a mistaken idea that chromed bores is somewhat akin to chrome plating on a car bumper, that can begin to peel off if messed with. It's not. It's entirely different. I believe it was either Dean or Dewey V. that explained this to me a couple years ago.
Best wishes, SRH
Skeet's Gun Shop
918-456-4749