How difficult to fit barrels?

[Brush Buster]

Tom, I can't answer your question but I have a neat scenario, I have a VH ,16 Ga. on an O frame,and a 20 ,Ga. ,GH Grade,on the O frame, the 16 Ga. barrels and foreend fit right on the 20 Ga. frame, lock up tight and appear as if they were made for the gun, and I use the gun this way alot , but the 20 Ga. barrels are not even close to being able to fit the 16 Ga. frame .Also the 20 Ga. fore end will not work with the 16 Ga. barrels . Don't know why but I bet I am not the only one that has seen this ! Russ

[Bruce Day]

The conventional wisdom is that they can usually be fitted without undue machining if they are within 10,000 sn's of each other. There are no sure things with fitting extra or replacement Parker barrels.
Hope this has been useful in your considerations.