Some gunsmiths can sleeve the choke. The way they do it is to screw in a very thin choke. It is soldered in place. Then it is bored to correct size. I have seen the finished product. Very hard to tell unless you know it is there and look hard. You can usually see it at the muzzle because the choke is usually a different color metal compared to he barrel. Usually can't tell by looking down the barrel from the breech end
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