Yamaha K-31 Service Manual download pdf (Page 71)

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Shooting with a blocked barrel will cause a barrel bulge

Bulged Barrel

Fractured Bulge

Blocked, exploded barrel

Exploded Barrel

Before each shooting session, check to ensure the weapon is not blocked!

Barrel Inspection

Before each shooting session, especially under combat conditions, make sure that the weapon is not

blocked. By performing this inspection, you will avoid a barrel bulge, in other words, unnecessary

expense to the State and to yourself.

A barrel bulge is caused by a abnormal increase in pressure inside the barrel, specifically, if the barrel

is blocked in near the muzzle by grease, dirt, snow, water, or whatever foreign object. A piece of

cleaning rod, or cord in the barrel can cause an explosion while shooting.

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Yamaha K-31 Service Manual Page 71