(2) Eye Relief. Eye relief is the distance between the rear sight aperture and the aiming eye (see figure 4-6). Normal eye relief is two to six inches from the rear sight aperture, depending on the firing position. Every Marine is different. The distance between the aiming eye and the rear sight aperture depends on the size of the Marine and the firing position. While eye relief varies from one position to another, it is important to have the same eye relief for all shots fired from a particular position.
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