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May I have your collective opinions on barrel timing?

This is a discussion on May I have your collective opinions on barrel timing? within the Gunsmithing forums, part of the M14 M1A Forum category; Hi. Finally getting to the slow process of assembling an M14 from parts. Have a Fulton receiver, and a Criterion Chrome-lined barrel. The M14 Complete ...


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Old March 18th, 2017, 03:32 PM   #1
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May I have your collective opinions on barrel timing?

Hi.

Finally getting to the slow process of assembling an M14 from parts.

Have a Fulton receiver, and a Criterion Chrome-lined barrel.

The M14 Complete Assembly Guide says that after hand-tightening, in order to get the right draw pressure, I want to be roughly 7:00 to 8:00 as far as the divider in the feed ramps.

To me, this look a little more like 6:45 or so.





Is it okay, or do you dink with the barrel shoulders to add more draw pressure, or ask to exchange the barrel?

Would appreciate your opinions. I'm going to send the same image and question to Fulton Armory to ask what they think. They sold me both, and have had great customer support in the past, so I'm optimistic of outcome, whichever way it goes :)

Thanks much!

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Old March 18th, 2017, 03:45 PM   #2
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Looks about right
The timing stopping point is pretty critical make sure it's right

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Old March 18th, 2017, 03:56 PM   #3
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Don't worry, it will be plenty tight.

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Old March 18th, 2017, 04:04 PM   #4
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That is not the correct reference point..

Would appreciate your opinions. I'm going to send the same image and question to Fulton Armory to ask what they think. They sold me both, and have had great customer support in the past, so I'm optimistic of outcome, whichever way it goes :)

Thanks much![/QUOTE]

Use the top flash suppressor key-way, 12 to 15 degrees short hand tight... Art

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Old March 18th, 2017, 04:11 PM   #5
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find who has this
http://www.brownells.com/gunsmith-to...prod25088.aspx
and 2 small levels

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Old March 18th, 2017, 04:11 PM   #6
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I used to have a rifle with an "overtight" barrel and the front sight wanted to hang off the ledge a little. So it can affect windage if timing is off.

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Old March 18th, 2017, 05:05 PM   #7
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That looks about perfect.

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Old March 18th, 2017, 05:22 PM   #8
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Looks like a great start to me. Be careful though. When you're done with that one... Well, you'll see. They tend to multiply somehow.

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Old March 18th, 2017, 10:09 PM   #9
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Quote:
Originally Posted by art luppino View Post
Would appreciate your opinions. I'm going to send the same image and question to Fulton Armory to ask what they think. They sold me both, and have had great customer support in the past, so I'm optimistic of outcome, whichever way it goes :)

Thanks much!
Use the top flash suppressor key-way, 12 to 15 degrees short hand tight... Art[/QUOTE]

Ah, that is much more specific!

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Old March 18th, 2017, 10:11 PM   #10
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Quote:
Originally Posted by Jeff42899 View Post
Looks like a great start to me. Be careful though. When you're done with that one... Well, you'll see. They tend to multiply somehow.
So long as it happens at a rate I can afford, and still get the bathrooms finished in a semi-timely manner, I'll do my best to deal with a growing family

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Old March 18th, 2017, 10:37 PM   #11
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You cant check your barrel timing with the proper tool! Introducing the latest thing to hit the M14/M1A builder club! The Clock Amatic!
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Old March 19th, 2017, 06:23 AM   #12
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New Timer, verey nice..

Quote:
Originally Posted by MuppetMeat4Me View Post
So long as it happens at a rate I can afford, and still get the bathrooms finished in a semi-timely manner, I'll do my best to deal with a growing family

It is a nice visual aid, but the fact remains the machined center between the two feed ramps has little to do with the flash suppressor being in a vertical position, which is required if the post is to be vetical.. Without a vertical post the rifle will have to ne canted.. Art

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Old March 19th, 2017, 07:28 AM   #13
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I have installed quite a few barrels that were cut, so no front sight/flash hider slots to use at indexxing. Instead I used a Gas Ring Front Sight and indexxed off the gas assembly slots. Not as precise but good enough for a shorty.

I have seen dozens and dozens of Chinese/Canuck M14 clones, new out of the box, with glaringly obvious out of index front sights. Some were over indexxed, some under indexxed, and some that upon further close examination have barrels that are indexxed perfectly, but the flash hider lugs or the top of the front sight base are angled. This rarely effects the reliability of the system, but shooting with a front sught that is at an angle is quite annoying.

With the BLACKFEATHER ALLOY CHASSIS SYSTEM, getting the proprietary replacement rectangular op rod guide PERFECTLY aligned with the receive, is critical to proper fit between receiver and alloy forend, and of course, also for aligning the op rod with the reciver for proper travel. Other than this, barrel indexxing is most critical to those using iron sights.

NOTE:
BARREL INDEXXING IS NOT ALWAYS THE SAME FOR EACH PILE OF PARTS!
W orking with chrome lined barrels, and getting head space just right, re-using well used takeoff barrels, and insralling commercial replacement barrels with straight shoulder [VS crushable undercut shoulder] all can have an effect on how much "draw" and rotation and torque work best.

PS: There is a reason the Chinese hide a lock screw under the op rod on their M14 clones. SOME ( NOT ALL ).of the Chinese barrels seem to be made of softer steel, and the barrels will not stay tight. I have seen three of these where the factory installed barrels came loose and could rotate with hand pressure.
SCARY!!
LAZ 1

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Old March 19th, 2017, 10:39 AM   #14
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Quote:
Originally Posted by art luppino View Post
It is a nice visual aid, but the fact remains the machined center between the two feed ramps has little to do with the flash suppressor being in a vertical position, which is required if the post is to be vetical.. Without a vertical post the rifle will have to ne canted.. Art
I understand. I didn't mean to use the feed ramps as a final determination. Plan on using a set of levels on receiver and flash suppressor adapter/sight dovetail thingie. Don't remember what it's called, but I'm sure you do!

Thanks all for your responses. It's great to have access to your experience.

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Old March 19th, 2017, 10:49 AM   #15
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Quote:
Originally Posted by POLACK View Post
find who has this
http://www.brownells.com/gunsmith-to...prod25088.aspx
and 2 small levels
That dealiewhop you mentioned looks pretty cool, once you see how it works.

http://www.badgerordnance.com/media/...tions_copy.pdf

Do you think it will give more precise alignment than just levels? Seems kind of reasonably priced for what it is, especially if I change out barrels in the future.

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