Question - Are the mounting screws on this sight correct?

The head of the screw at the rear of the sight sits flush with the sight.  The head of the screw at the front sight sits proud of the sight base.  You can see from the attached photos that in addition to being a longer screw (necessary) the head of the front screw is also 'taller/thicker'.  Both screws engage the barrel by about the same amount.  The front screw is either the wrong screw, or there is an interesting reason it is used. 

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