Lapping?

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14 years 2 months ago #5415 by inmysights
Lapping? was created by inmysights
Ok, so Armalite says the stainless barrel on my AR10 is "triple lapped." Exactly what does this mean, and the benefits of repeating it, if any?

I remember from my hotrodding days we used to lap the valves with an abrasive to "seat" the valves to give the valves a truer face in the cylinder head. Normally this was done with a suction cup mounted on the end of a handle and spun by hand (or a drill if you were brave).

Is this similar to what Armalite is doing with the barrels? Or are they referring to the torquing sequence they explain in the Tech Notes?

Thanks!

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14 years 2 months ago #5416 by mrraley
Replied by mrraley on topic Re:Lapping?
Lapping is either pushed or pulled through the barrel in the direction the bullet travels. It takes off burrs and sharp edges from the rifling.

Lapping document I found online

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14 years 2 months ago #5423 by inmysights
Replied by inmysights on topic Re:Lapping?
Thank you. The link was quite helpful! :)

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