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 Truing an AR receiver 
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I saw recently, when looking at X-caliber barrels, that they have a lapping tool for truing AR receivers.

They show still pictures of the lapping process and how on a receiver the anodizing will wear on one side as the lapping progresses.

The lapping tool is about $100.00.

Have any of you guys gone to this length when building an AR? (Ron? anyone?)

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Fri Jan 11, 2019 2:19 pm
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It helps along with gluing the barrel to the receiver.


Fri Jan 11, 2019 3:05 pm
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Gluing?

Image

What? How?

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“A return to First Principles in a Republic is sometimes caused by simple virtues of a single man. His good example has such an influence that the good men strive to imitate him, and the wicked are ashamed to lead a life so contrary to his example. Before all else, be armed!” ~ Niccolo Machiavelli


Fri Jan 11, 2019 3:18 pm
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I prefer to let the BCG do the lapping work for me. During live fire, of course.


Fri Jan 11, 2019 3:26 pm
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Seems unnecessary to me. Plenty accurate AR's exist without this service.

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Fri Jan 11, 2019 3:44 pm
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Compliments of Old N' Cranky:

http://bulletin.accurateshooter.com/201 ... -revealed/

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"The said constitution shall never be construed to authorize Congress to prevent the people of the United States who are peaceable citizens from keeping their own arms." ~ Samuel Adams

"I love Girl Scout Crack!" ~ usrifle

“A return to First Principles in a Republic is sometimes caused by simple virtues of a single man. His good example has such an influence that the good men strive to imitate him, and the wicked are ashamed to lead a life so contrary to his example. Before all else, be armed!” ~ Niccolo Machiavelli


Fri Jan 11, 2019 4:06 pm
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I true all of mine

Some uppers are pretty good, others not so much. You can see how off it is as the anodizing gets worn through. Brand doesn't seem to matter. I've had Anderson uppers that barely needed anything and BCM uppers that took a while to get all the way around. Forge marks are the same. Cerro, Anchor Harvey, etc. I haven't noticed a difference, but I've only done a dozen or so.

I can't say that accuracy will improve greatly just by lapping the upper. Reliability and longevity certainly will. The bolt has a bit of freedom inside the carrier. Once it's locked up with the barrel extension it should be fairly square to the chamber (unless the receiver face is terribly off). Even with the face off a bit it will run. Proper alignment just ensures that the bolt hits the barrel squarely every time. One side of the bolt isn't going to hit first and stress that side over and over again.

When I build an upper I'm not satisfied until the bolt slides into the barrel extension with very little effort (gas tube alignment plays a role in this too). The test is to hold the upper (by itself) upside down and release the BCG from the rearmost point of travel. With no other pressure it should slide into the barrel extension and lock up. The angle I can hold it at to make that happen tells me how good of a job I did. The more shallow the better.

Another benefit of lapping is that the barrel will center inside a free float hand guard. That's important for a few reasons. If you run a suppressor under the hand guard with limited clearance it keeps things from touching. It also affects windage on your rear sight. If your front sight is on the float tube and the barrel is pointing somewhere else you're going to have to crank the sights and optics to one side to make it work.

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Fri Jan 11, 2019 6:53 pm
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I'm just going to FUD out and say I'm not glueing any barrels to any receivers. I get less than 3/4" groups at 200yds with a good does of anti-seize around the barrel extension.

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Fri Jan 11, 2019 7:04 pm
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dreadi wrote:
I'm just going to FUD out and say I'm not glueing any barrels to any receivers. I get less than 3/4" groups at 200yds with a good does of anti-seize around the barrel extension.


I believe that’s what he’s talking about.


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Fri Jan 11, 2019 7:36 pm
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RocketScott wrote:
dreadi wrote:
I'm just going to FUD out and say I'm not glueing any barrels to any receivers. I get less than 3/4" groups at 200yds with a good does of anti-seize around the barrel extension.


I believe that’s what he’s talking about.


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jukk0u wrote:


Quote:
4. Barrel Extension: You should Loctite or glue the barrel extension into the upper receiver. This holds it in place all the way front to back in the upper receiver. Otherwise if there is any play (and there typically is) it just hangs on the face of the upper receiver completely dependent on the face of the upper receiver as the sole source of support for the barrel as opposed to being made more an integral part of the upper receiver by being glued-in.

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Fri Jan 11, 2019 7:45 pm
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jukk0u wrote:


Some good bits in there. Thanks.

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Fri Jan 11, 2019 7:47 pm
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dreadi wrote:
RocketScott wrote:
dreadi wrote:
I'm just going to FUD out and say I'm not glueing any barrels to any receivers. I get less than 3/4" groups at 200yds with a good does of anti-seize around the barrel extension.


I believe that’s what he’s talking about.


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jukk0u wrote:


Quote:
4. Barrel Extension: You should Loctite or glue the barrel extension into the upper receiver. This holds it in place all the way front to back in the upper receiver. Otherwise if there is any play (and there typically is) it just hangs on the face of the upper receiver completely dependent on the face of the upper receiver as the sole source of support for the barrel as opposed to being made more an integral part of the upper receiver by being glued-in.


I’m not getting your point

You’re saying that you don’t glue them together, but you do?


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Fri Jan 11, 2019 7:50 pm
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^^^ I'm confused too.


Fri Jan 11, 2019 7:57 pm
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So... is anti seize the same as "gluing" in the linked article?

No. Dana said he was going to use anti seize. The article says to use GLUE. They have opposite functions, I believe.

Marine-tex rapid set is the glue to which I was directed.

What/who's lapping tool do you use, RS?

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"The said constitution shall never be construed to authorize Congress to prevent the people of the United States who are peaceable citizens from keeping their own arms." ~ Samuel Adams

"I love Girl Scout Crack!" ~ usrifle

“A return to First Principles in a Republic is sometimes caused by simple virtues of a single man. His good example has such an influence that the good men strive to imitate him, and the wicked are ashamed to lead a life so contrary to his example. Before all else, be armed!” ~ Niccolo Machiavelli


Fri Jan 11, 2019 8:08 pm
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No. I am not glueing any receivers and barrels together.

That article said to do so.

I'm still not going to do it.

Based on my myopic opinion of using automotive Anti-Seize on the barrel extension and still getting less than 3/4" groups at 200yds. I ain't glueing or using any thread locker to any barrels and receivers.

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Fri Jan 11, 2019 8:17 pm
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