IRON SIGHTS: This plate is made to allow the tall factory sights to sit just above the bottom of an Acro window. You will have 1/2 of the white dot on the front sight to show. Factory rear sight is .400” tall. If you like more showing, the Dawson Precision #310-049 will give you just at the lower 1/3 line. The XS sights R3D 2.0 M2.0 Optics Ready is also slightly taller than Factory but a little shorter than the Dawson Precision.