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7 years ago
I’ve done a number of these. In fact, I did an AR10 and AR15 clone this weekend. Don’t remove and then re-insert the tool from the receiver like he did while lapping. You will get lapping compound on the inside of the receiver and lap the internals – something that doesn’t need it. Or you will have to clean and re-lube the tool each time which is a pain. Ask me how I know.
Instead, just remove the lapping tool within the bounds of the rebated part of the tool. Clean the top of the receiver with a rag and solvent and check it with a flashlight to insure the whole surface is lapped. This can take a while with 220 grit lapping compound. Even one that isn’t out much can easily take 5 minutes of lapping.
This article is filed under the category(s) AR-15s and was published March 3rd, 2019 by Herschel Smith.
If you're interested in what else the The Captain's Journal has to say, you might try thumbing through the archives and visiting the main index, or; perhaps you would like to learn more about TCJ.
I’ve done a number of these. In fact, I did an AR10 and AR15 clone this weekend. Don’t remove and then re-insert the tool from the receiver like he did while lapping. You will get lapping compound on the inside of the receiver and lap the internals – something that doesn’t need it. Or you will have to clean and re-lube the tool each time which is a pain. Ask me how I know.
Instead, just remove the lapping tool within the bounds of the rebated part of the tool. Clean the top of the receiver with a rag and solvent and check it with a flashlight to insure the whole surface is lapped. This can take a while with 220 grit lapping compound. Even one that isn’t out much can easily take 5 minutes of lapping.