Vall,
The flats are integral to the barrel and Morris created them on a 1.300" barrel blank using the HAAS CNC.
All of the other barrels were also profiled from large round blanks on the HAAS.
Absolutely amazing thee HAAS machine can build those flats integral and get the round contour so perfect between the Rigby flats also! I have always been amazed how Marlin turned out the flats on a short tube and internally threaded it and the barrel to put them together. But this is even more amazing that machines today can do this in one piece and be so perfect!
