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Old November 2, 1999, 12:05 PM   #1
Drew
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Join Date: October 14, 1999
Location: Oregon
Posts: 56
What is the process of lapping something on your firearm?

I read a post on another board asking what is bolt lapping and can you do it yourself? He didn't get any replies. I don't know what it is either. Can you guys help?
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Old November 2, 1999, 01:41 PM   #2
Jim V
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Join Date: January 31, 1999
Location: SE Michigan - USA
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Drew, lapping is rubbing two pieces of metal together with an abrasive paste so that the two pieces mate better or to assure one piece is perfectly flat.

Rough bores in firearms can be "fire lapped" by coating a bullet with such a paste and then firing them through the firearm.

As to lapping the bolt on a rifle, I have never done it so I can not advise on the methods used. I would assume that minute amounts of the lapping compound (such is the name of the abrasive paste) would be applied to the locking lugs of the bolt, the bolt inserted in the rifle and then open and clost the bolt several times. The number of times would depend on the grit of the lapping compound and how fast you wanted to screw up the rifle if you went too far causing excessive head space.

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Old November 2, 1999, 02:45 PM   #3
Gale McMillan
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Don't lap the lugs on a rifle that the barrel has been chambered because it will change the head space. The time to do it is when you are going to replace the barrel.
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