Yamaha K-31 Service Manual download pdf (Page 81)

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5. Using the Muzzle Cover

-Protect the rifle barrel with a muzzle cover.

-Aside from issued muzzle covers, other cover are authorized for use, such as celluloid, bakelite or other

soft material or metal, providing they fulfill the following conditions:

1. Weight not greater than 1.3g

2. Held to the barrel by slots that provide space so the barrel is not hermitically sealed.

3. Will not cause the barrel to be sealed by grease or a patch. (risk of barrel bulge)

Bakelite Steel

6. Sighting in the weapon

The impact point of your weapon is good, if when aiming at the 6 o’clock position, the shots hit the center

of the target.

Good impact point Impact point offset

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Yamaha K-31 Service Manual Page 81