I do not believe it is a sin to make a gun more useful for your purpose.

Altering choke is ok.

The word "choke" merely means the barrel had some choke at proof, it does not refer to any specific degree of choke like some Belgian guns do when they are stamped with bore and choke size markings.

I caveat that with an exception, a highly collectable, and valuable gun in pristine condition should be left alone if your purpose is collecting investment as any alterations affect value. If it is a shooter a not some unique gun have at it

Michael Dittamo
Topeka, KS