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This is a discussion on Opinions please within the Gunsmithing forums, part of the M14 M1A Forum category; While cleaning and checking a few things on my new rifle I noticed a small gap at the top of barrel between the gas cylinder ...


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Old February 26th, 2017, 05:53 AM   #1
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Opinions please

While cleaning and checking a few things on my new rifle I noticed a small gap at the top of barrel between the gas cylinder lock and the gas cylinder. After removing the gas piston for cleaning I tried to loosen the lock by hand to see if it was tight. I used my tools to loosen the lock it was very tight, clocked at 3:30 for hand tight. I looked at the gas cylinder and just pulled it off with little resistance, there was a lot of blow by around it.

I replaced the gas block with a unitized part I had on hand and fitted a different gas lock to clock at 5:00. When I finish tightening it the gap wasn't present. I will see if there is a difference at the range later, here are my questions.

1. I have never seen a gas block that loose, usually have to use a wooden dowel to remove them. Is it common to see them this loose.

2. Could the gas lock being too tight affect accuracy?

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Old February 26th, 2017, 09:12 AM   #2
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Pictures please.

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Old February 26th, 2017, 09:21 AM   #3
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A gas lock can definitely be to tight. It can bind the gas system and bend the barrel minutely.

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Old February 26th, 2017, 10:10 AM   #4
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Chief what were you wanting a pic of? I've already changed the parts and hopefully will be able to test fire on Tuesday.

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Old February 26th, 2017, 06:01 PM   #5
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They say that a picture is worth a thousand words and we always like to see what you are working on.

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Old February 26th, 2017, 06:31 PM   #6
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I . forget it, not worth my time.

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Old February 26th, 2017, 06:48 PM   #7
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There are no opinions on this forum.

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Old February 27th, 2017, 03:00 PM   #8
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Yeah, like saying a bullfrog doesn't bump his a$$ every time he hops.

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Old February 27th, 2017, 04:22 PM   #9
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Originally Posted by diegokid View Post
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2. Could the gas lock being too tight affect accuracy?
-----------------------
Of course it MIGHT, but no way to know whether for better or worse.

It seems to me that the over tightend gas lock was somehow bending the 'supposed to be flat' mating surfaces between the cylinder and the lock out of alignment, and that's what caused the gap.
Be glad that the threads on the barrel didn't strip ...

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Old February 28th, 2017, 04:31 AM   #10
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1 - Seems to vary, but a tight fit is more ideal, thus why some peen the barrel splines to tighten them up.

2 - Absolutely. It can also cause the piston to drag if it's warping the cylinder.

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Old February 28th, 2017, 05:25 AM   #11
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Yeah I wasn't happy it shipped that way. Anyway was hoping to fire it today but have to work now.

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Old February 28th, 2017, 05:49 AM   #12
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Most USGI gas cylinders will simply slide right off a USGI barrel. Commercial cylinder to barrel fit is usually much tighter (tighter tolerances).

The gas lock should just be finger tight. Anything more can put tension on things when they heat up. POI will usually be higher.

USGI gas locks usually don't tighten until about 10 o'clock. They get backed down to 6 and the plug is installed. When the rifle fires, the assembly is pounded forward by the oprod. This is why gas locks are usually tight when removed and loose when installed.

Early National Match instructions call for the gas cylinder to be tapped forward against the lock before the plug is installed and tightened.

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