I have had extra sets of barrels fitted and the biggest key I found was that the barrels and receiver need to come from the same era. If not, there is too much difference in the lugs to be fitted to the receiver. A couple of years ago there was an article in the Parker magazine about it.

Best of luck!

There a set on GI - Parker 0 Frame 20ga Barrels, 30" F/F

Before trashing the barrels I would very much like to evaluate them
https://docs.google.com/document/d/1...K7G9IBs4g/edit

You can contact me at drewhausemd@yahoo.com

Drew I will have the barrels in a few days. I'll take better photos then what I already have and send them to you. Stay tuned.

Thank you Christopher