The G3 rear sight windage screw can be found in the base of the rotary rear sight assembly and is used to adjust the aim point of the rifle to the left or right. It is an original factory part made in Germany by HK.

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Windage

All this talk about windage, but do we know what it actually is? Windage is the effect of wind on the course of a projectile – in this case a bullet. To adjust the sights, first loosen the rotary rear sight assembly mounting screw. Then, simply turn the windage screw in accordance with the required direction. If the point of impact is to the left of the target, move the sight to the right, and vice versa. Finally, retighten the mounting screw.