The WR rifle in question has the "Patent Westley Richards Foresight" that has a hood that folds to the rear.

If you go the WR website & look @ bolt action rifles they have a drop down box of options & a close up picture of it that shows the sight with the hood folded back. The shape of the ramp is self explanatory. I think folding the hood back also moves a larger "moon" sight into place for shooting in dim light.

A similar front sight is common on their double rifles also.