That is dependent on the height of the front sight in question, but assuming you are asking about an AR-15 fixed front sight, this mount might be a little too short. Overall height of this mount to optical center is 1.45" while the height of a fairly standard fixed front sight on an AR-15 is approximately 1.41".
At 3x magnification you may see a blurry image of the top of the front sight near the bottom of the field of view, but past 4x, the magnification should push your field of view past the front sight.