Don,
I just tried an early/late combination with success. My concern about the different cannons is based on an upper/lower (1910/1917) mismatch shooter. When I received the gun, there was some drag in sliding the cannon in the frame and I discovered that the very back of the cannon rails were slightly mushroomed. I had assumed this was from contact with the reinforced frame and filed them to the "new" profile.
KFS
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