I'm trying to mount a 4-12x40 scope using a Burris PEPR one piece mount on this rifle. Does the front sight have to be removed? Everthing is mounted, I can get a good check weld, my eye is about 4 inches from the eyepiece to achieve complete field of view of the cross hairs.. The front sight is not visible. the front sight is about 2 inches away from the objective lens. How does this setup effect zeroing in and the ultimate accuracy of the scope.