On a 1911 the rear sight is always higher than the front. The line of sight on any gun needs to be fairly close to parallel to the centerline of the barrel. A 1911 barrel is level with the slide rails only when the action is open. When closed, the barrel is pointing downward to the front compared to the slide rails. Thus the sights need to be angled the same amount. Most are in the 1 to 1-1/2 degree range, depending on how the barrel is fitted to the slide.
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