Carcano,
While it still does not look like a bushed firing pin (to me), which would likely be better fit, I can concede that it is possible. Conversion of "hound's tooth" strikers to gas tight bushed firing pins was a common cause of having to install bushings. I admit I haven't seen everything, but I think it would be difficult to fit a hound's tooth striker into a drilling for the rifle barrel, as opposed to the rifle barrel of a BF. Since neither of us has first-hand knowledge of what happened, your guess is as good as mine.
Mike
