I recently purchased a Model 69 and couldn't be more please with the workmanship and more importantly, accuracy.

The Model 69's two piece barrel is engineered/designed so that it is impossible to ever be canted. The outside of the barrel is simply a shroud that is keyed into a notch on the frame. The inside of the barrel is then threaded into the outside shroud.

It appears the Model 66-8 (I've never seen one in person) utilizes the same design which now has me lusting after one of those too. This excellent design feature is dangerous to my financial health!!!