I am in total agreement with Smallbore on this matter, but a couple of caveats for "American" guns. Several makes of US guns used the so called "Taper Chokes" which do not have a parallel section at the muzzle. One of these which has been opened up can be quite readily detected as "Non-Original" so one will need to consider if this will actually be a detriment to it's future value.....
I realize the gun in the original question here was British, so this would not be applicable to it, but am adding this for others.
I was under the assumption that British guns originally had the same types of taper chokes making a change in choke detectable, perhaps I am wrong.
Also, would original records, if still available for a particular British gun, show what chokes were original to the gun? Did the high end makers keep this kind of info?
