LC, I blew right past that difference without being near enough to any of them to take measurements. Hopefully, more information will be forthcoming; Nothernug mentioned in a PM that Mr. Bogdanovic may be publishing more work soon in the U.S. What that may be is unknown.
I wonder if there are any standard length rifles that have been noted with 1. A windage-adjustable front sight base, and/or 2. Very low, three digit (or less) numbers?