Yamaha K-31 Service Manual download pdf (Page 82)

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Weapons where the impact point is offset should be sighted in.

Sighting in is a gunsmith’s job

The gunsmith has in his equipment, several types of front sights that will allow him to adjust the elevation

of the impact point. The windage adjustment is accomplished by moving the front sight.

If moving the front sight will not change the impact point, for example while shooting during off-duty.

Refer to the cantonal arsenal that is closest to your domicile.

Proper reassembly and proper screw pressures on your weapon are essential for weapon accuracy.

Modifications to the elevation adjustment and front sight are

prohibited.

After sight adjustment, the gunsmith will mark the front sight.

A front sight housing marked in this fashion is unusable and should be changed.

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Yamaha K-31 Service Manual Page 82