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Unitizing Gas Cylinder with Adhesives

This is a discussion on Unitizing Gas Cylinder with Adhesives within the Gunsmithing forums, part of the M14 M1A Forum category; I've done a search and I know there is a ton of posts about unitizing via various methods. Was wondering if anyone has an update ...


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Old January 12th, 2017, 12:29 PM   #1
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Unitizing Gas Cylinder with Adhesives

I've done a search and I know there is a ton of posts about unitizing via various methods. Was wondering if anyone has an update on longevity of JB Weld or tried other adhesives using the same approach.

Thanks for any updates

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Old January 12th, 2017, 12:46 PM   #2
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I did one with JB Weld. The first time it did fail and came apart.

The second time I did some rough sanding on the mating surfaces and cleaned more thoroughly with acetone. Holding good so far.

You will need a fitting tapered dowel or similar to center the pieces at the barrel hole while the epoxy dries.

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Old January 12th, 2017, 12:49 PM   #3
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JB Weld, like other adhesives can be used as a temporary method to secure the barrel band to the gas cylinder. However, just like silver solder, it cannot be counted on for a permanent fix. So far the Navy and Army (welding or screwing together) methods of unitizing gas cylinders have proven most effective. Welds have been known to break and screws can shoot loose, but properly done both methods are superior to adhesives.

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Old January 12th, 2017, 01:16 PM   #4
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m-i-c-k-e-y m-o-u-s-e

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Old January 12th, 2017, 02:50 PM   #5
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Quote:
Originally Posted by JMQ4 View Post
I've done a search and I know there is a ton of posts about unitizing via various methods. Was wondering if anyone has an update on longevity of JB Weld or tried other adhesives using the same approach.

Thanks for any updates
Sometimes there are no cheap, short-cut substitutions for doing a job the right way.

My grandfather on work ethics to this young "weedhopper": "It takes less time to do a job right the first time than it does to come back and do it again - or to explain why you didn't do it right the first time."

Unitizing: If the funds are short, save up for it to be done right by an experienced person who can custom fit the job to your rifle.

Have you tried shimming? That is a DIY procedure. No JB Weld needed. Best wishes!

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Old January 12th, 2017, 03:05 PM   #6
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It's not money, or anything for that matter, just out of curiosity. Looking at the parts to be mated, it seems that there isn't much area for JBW, etc., to bind parts together. Being an irreverent tinkerer, always willing to listen to and learn new things, but in this instance, appears that tried and true is the way to go.

Yes, have shimmed.

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Old January 12th, 2017, 03:31 PM   #7
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Quote:
Originally Posted by JMQ4 View Post
It's not money, or anything for that matter, just out of curiosity. Looking at the parts to be mated, it seems that there isn't much area for JBW, etc., to bind parts together. Being an irreverent tinkerer, always willing to listen to and learn new things, but in this instance, appears that tried and true is the way to go.

Yes, have shimmed.
I wish there was a workable shortcut - I would have done it myself. I'm sorry that I could not offer a substantive alternative. More best wishes!

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Old January 12th, 2017, 04:07 PM   #8
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And best wishes to you DDR

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Old January 12th, 2017, 04:11 PM   #9
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Quote:
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I wish there was a workable shortcut - I would have done it myself. I'm sorry that I could not offer a substantive alternative. More best wishes!
Quote:
Originally Posted by JMQ4 View Post
And best wishes to you DDR
Dating or Bromance?

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Old January 12th, 2017, 07:32 PM   #10
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Dating or Bromance?

For a moment I felt his pain as a fellow tinkerer - "the agony of defeat" (Que the old ABC "Wide World of Sports" video of that guy coming off of the ski jump). I've wasted some time and money in my earlier (monetary) lean years sometimes using "spit and bailing wire" for temporary solutions to get me down the road. And as good as duct tape is for a lot of things, I wouldn't recommend it this time. :-)

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Old January 12th, 2017, 09:20 PM   #11
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I personally shim due to my stock choice.

Below are some choice words posted in 2005 by highly qualified professional.

"The USAMTU method is the one I prefer and do. It involves annealing the spindle valve and barrel band so they can be drilled and the valve tapped. The screws are epoxied and staked in place to insure they do not shoot loose." Ted Brown

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Old January 12th, 2017, 09:46 PM   #12
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On my recent purchased LRB it is screwed together AMU style.

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Old January 13th, 2017, 07:26 AM   #13
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I have one that's screwed and glued, one that's welded and one that's shimmed (cut shims). All work okay. I did the shimmed myself and it works as well as the other methods.

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