DFactors Affecting Sight Alignment and Sight Picture

(1) Stock Weld. Stock weld is the point of firm contact between the cheek and the stock of the rifle (see figure 4-5). The head should be as erect as possible to enable the aiming eye to look straight through the rear sight aperture. If the position of the Marine's head causes him to look across the bridge of his nose or out from under his eyebrow, the eye will be strained. The eye functions best in its natural forward position. Changing the placement of the cheek up or down on the stock from shot to shot may affect the zero on the rifle due to the perception of the rear sight aperture. A consistent and proper stock weld is critical to the aiming process because it provides consistency in eye relief which affects the ability to align the sights.

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