If you already have both the front and rear bases and want to fit them to an existing action without piercing the front ring, it seems to me that it would be easy to calculate the height needed at the rear in order to ensure that the front ring remained as whole as possible.

IOW IMO a good smith can make it work without any difficulty at all.
Regards, Joe


You can lead a man to logic but you can't make him think. NRA Life since 1976. God bless America!