Firstly, I am not an expert. Second, I have worked on a few of these rifles for customers. I have noticed that the front sight "drum" or "cylinder" is indexed and marked to the left or right (opposite of the cant) on many of the rifles that I have worked on.
In other words, the front and rear sights were "zeroed" and marked by who ever put the rifle together originally. I would guess that front sight cant was not such a very big deal to the original manufacture.
I have been asked to correct front sight cant, recenter the front sight post between the front sight protective "ears", and test fire the rifle at 50 yards.
I usually redrill the front sight pin holes over size, make and install new front sight pins out of oil hardening drill rod.
I hope that this will sort of answer your question.
Yours,
One Rusty Nut.