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Manufacturer Answer
This will be compatible with the Pedersoli Rolling Block, however, you will need to drill and tap the barrel.
There should be one hole already predrilled for the rear sight on the Pedersoli Rolling Block. You will need to drill 3 more for the bases. The Malcolm 6X Two Tone rifle telescope comes with flat bottom bases for octagon barrels, while the Malcolm 3X and 6X short rifle telescopes have bases with a slight radius that can work with either round or octagon.
You will need to space the mounts 7.250" from center to center to get 1/4 MOA adjustments on the Malcolm 6X Two Tone scope.