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bedding the barrel?

This is a discussion on bedding the barrel? within the M16 AR15 forums, part of the Rifle Forum category; Hi all, I am about to give up!! I had to take my AR apart to send in the barrel for a chamber job and ...


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Old November 30th, 2016, 04:42 PM   #1
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bedding the barrel?

Hi all, I am about to give up!! I had to take my AR apart to send in the barrel for a chamber job and I am supposed to get it back soon. So, to make it a little better than it was I started to read about accurizing the AR..................big mistake! My first question is something that every expert I read about has a different take on bedding the barrel to the reciever. So, should I do it, what "stuff" do I use(red/blue/green loctite, hi temp silicone. etc)?

Any light you can shed would be appreciated.

thanks

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Old November 30th, 2016, 06:40 PM   #2
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http://www.longrangehunting.com/arti...te-ar-15-1.php
use a good synthetic grease or anti seize compound on the barrel nut

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Old November 30th, 2016, 08:10 PM   #3
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I've never heard of bedding an AR barrel. You use grease on the barrel extension and barrel nut threads to make it easier to remove when swapping out, etc. Use just enough but ensure you tighten with the correct torque and you should be able to count on the best accuracy possible. This is given the other options like a free floated barrel and handguard set up.

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Old December 1st, 2016, 06:16 AM   #4
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I think I get what op is asking. Barrel extension to upper fit, correct? The answer is don't bother. If there is play between them, shop around for a new upper. Yes the barrel nut will snug it up, but it will not be optimum.

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Old December 1st, 2016, 06:47 AM   #5
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bedding AR barrel?

I read an interesting article in Home Shop Machinist during the summer about a procedure and, of course, an expensive tool to true/square the face of the receiver tenon. apparently, some receivers are not cut square to the boreline: the nut tightens on the high spot, the nut cants slightly and can loosen, etc

afterthought: Redraider, what is a chamber job?


Last edited by shooter86314; December 1st, 2016 at 07:06 AM.
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Old December 1st, 2016, 07:19 AM   #6
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or use beer cans. shim kit
https://video.search.yahoo.com/video...spart=att&tt=b

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Old December 1st, 2016, 09:40 AM   #7
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I have already squared the rcvr face, waiting to get my barrel back. Read ANY of the articles on building an ACCURATE AR and you will see the same things I have, multiple ways to fill any gap in a slightly loose fit barrel extension to rcvr and then you will see the multitude of ways it is dealt with. I was just looking for a concensus of the builders here to see what was the most used.

Keep the responses coming.

Thanks again

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Old December 1st, 2016, 10:15 AM   #8
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Quote:
Originally Posted by Redraider View Post
I have already squared the rcvr face, waiting to get my barrel back. Read ANY of the articles on building an ACCURATE AR and you will see the same things I have, multiple ways to fill any gap in a slightly loose fit barrel extension to rcvr and then you will see the multitude of ways it is dealt with. I was just looking for a concensus of the builders here to see what was the most used.

Keep the responses coming.

Thanks again

Redraider
If you have squared the receiver face than you should have good contact all around unless the barrel extension ring isn't perfectly square. Were you using a marking method to highlight the high spots or did you just uniform it relative to the upper's 'bore axis' Also check to make sure the barrel index pin is not a high spot now. Maybe you've checked that already. Check how your feed ramps in the barrel extension line up with the feed ramps on the upper now. If you squared the receiver the extension might fit a bit deeper now into the upper.

This is an interesting discussion. I've built two and the fit always seemed like it was uniform but not by measurement. But in the future I might look harder at it. In my case I would probably request a swap out maybe with sending my parts in for a fitting with the vendor.

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Old December 1st, 2016, 11:29 AM   #9
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Use a free float tube. If an AR won't shoot with known good loads, replace the barrel.
Might be helpful to know what make & model, type of barrel, twist rate and loads you are using just in case there is some issue there. Other than that, see the first 2 sentences.

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Old December 1st, 2016, 11:30 AM   #10
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Loctite 620, made for cylindrical surfaces large gaps. Used it when I built my Lilja .260.

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Old December 1st, 2016, 11:38 AM   #11
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Quote:
Originally Posted by Redraider View Post
I have already squared the rcvr face, waiting to get my barrel back. Read ANY of the articles on building an ACCURATE AR and you will see the same things I have, multiple ways to fill any gap in a slightly loose fit barrel extension to rcvr and then you will see the multitude of ways it is dealt with. I was just looking for a concensus of the builders here to see what was the most used.

Keep the responses coming.

Thanks again

Redraider
You could put grease or loctite all over the barrel extension. Some people use red loctite, others blue or purple.....

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Old December 1st, 2016, 04:41 PM   #12
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Quote:
Originally Posted by Redraider View Post
Read ANY of the articles on building an ACCURATE AR and you will see the same things I have, multiple ways to fill any gap in a slightly loose fit barrel extension to rcvr and then you will see the multitude of ways it is dealt with.

Redraider
There has been discussion on and off about this in the national match forums where builders including AMU, White Oak, and Keystone have given input. Granted, their opinions are concerning NM AR's for service rifle competition but top U.S. competitors still want the most accurate rifle possible. Their take is that it does not help accuracy, but won't hurt either. Just adds more work to build and especially when it's time to re-barrel. You may not burn through 3,000 rounds in a year, but they do.

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Old January 6th, 2017, 10:35 AM   #13
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UPDATE!!!!!!!!!!

Wow, I am still waiting for my barrel to get returned! To answer the question on "chamber job", you must commit alot of time in reading about the 6.5 Grendel history..............suffice it to say there were several "know-it-all" barrel makers that for their own reasons, cut chambers in barrels that were NOT SAMMI spec. This particular gunsmith offered to correct these "other" chambers to spec for $75.00. He is raved about by many but he has lost me forever when I do get my barrel!

Thanks for the replies

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