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
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