Had some time to kill and was playing with some old sights. I measured the height of the factory plastic sights, front and rear and then I measured the height of the mepro night sights. I don't have the numbers here but I found a discrepancy. the difference in height of the front to rear was not the same on both sets, the mepros had rear sights higher than the front an additional 0.020" than their plastic counterparts. I wonder how much difference .020" higher rear sights would make at 25 yards.