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Extractor failure, or dirty gas piston malfuction?

This is a discussion on Extractor failure, or dirty gas piston malfuction? within the Modern M14 forums, part of the M14 M1A Forum category; Hey guys this is my first post not sure if this is the correct section. But I have a m1a with a EBR so I ...


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Old June 16th, 2017, 08:05 AM   #1
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Extractor failure, or dirty gas piston malfuction?

Hey guys this is my first post not sure if this is the correct section. But I have a m1a with a EBR so I figured it's modern.

Recently my rounds haven't been successfully extracting. I used to be able to shoot a full mag no problem. Now it seems every 3 or 5 rounds I jam. The brass gets caught ejecting between the bolt and the sadlak airborne mount.

Oh here's a picture of my 100m zero today. Picture on the left is before. Picture on the right is after adjusting. I do 3 round zero so the outside hits are my 3 rounds. Then the center I did 4. 3 on the right side of the dot, adjusted a little left and decided to go back to what I had lol.



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Old June 16th, 2017, 08:20 AM   #2
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Is the brass hitting the mount? Welcome to the forum.

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Old June 16th, 2017, 08:26 AM   #3
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So clean your gas system and check again and then you will know.
I mean, you got to clean it any way so clean it . Do the tilt test before and after cleaning.

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Old June 16th, 2017, 09:15 AM   #4
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Originally Posted by Wasted ammo View Post
Is the brass hitting the mount? Welcome to the forum.
Normally not. But when it jams it's one to two things. pinched between the bolt and the mount. Or caught between the bolt and chamber.
Quote:
Originally Posted by Capona View Post
So clean your gas system and check again and then you will know.
I mean, you got to clean it any way so clean it . Do the tilt test before and after cleaning.
I'll clean it. I never had to clean my issued m14's piston unless I was over 500 rounds so that's why I'm asking

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Old June 16th, 2017, 09:34 AM   #5
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So clean your gas system and check again and then you will know.
I mean, you got to clean it any way so clean it . Do the tilt test before and after cleaning.
To me if they are getting far out enough to jam it's not the extractor.

Like Capona says clean and grease the Weapon and then we will see for sure.
I would imagine if you are up to an EBR you already know about and have seen Tony Ben's Cleaning and Mtam Videos.

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Old June 16th, 2017, 09:34 AM   #6
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No pics..

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Old June 16th, 2017, 09:37 AM   #7
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No pics..
I took a picture of the brass caught between the bolt and mount but it didn't save on my phone

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Old June 16th, 2017, 09:40 AM   #8
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number your mags and see if it's 1 mag or all mags? mag spring issue?
after you clean gas system,retry again.if problem persists,replace ejector/extractor springs
properly greased?
https://www.gunsprings.com/M14%20&%2...2/mID97/dID165
http://www.brownells.com/gunsmith-to...l-prod917.aspx

you don't know if those springs were military surplus or not,when they were made,or used,etc

try with mount off

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Old June 16th, 2017, 09:58 AM   #9
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Clean the chamber.

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Old June 16th, 2017, 12:24 PM   #10
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So long a gas port is aligned, op rod fits, and the gas system plus chamber are clean, one other possible cause is the ammo. If they're reloads are the sized properly? Or if it's steel cased plz don't admit it publicly on here.

After many rounds the gas cylinder can grow an unacceptable o.d. and allow gas to pass (harhar) and not give the op rod enough boost for extraction.

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Old June 16th, 2017, 01:11 PM   #11
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There are numerous things that can effect ejection timing and pattern. What have you changed recently? Stock, ammo, scope mount?

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Old June 16th, 2017, 01:17 PM   #12
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Originally Posted by Spike Spiegel View Post
Normally not. But when it jams it's one to two things. pinched between the bolt and the mount. Or caught between the bolt and chamber.

I'll clean it. I never had to clean my issued m14's piston unless I was over 500 rounds so that's why I'm asking

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Sounds like an ammo issue to me, what are you shooting?

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Old June 16th, 2017, 01:21 PM   #13
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Clean the chamber.
This would be recommendation numero uno.

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Old June 16th, 2017, 01:21 PM   #14
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There are numerous things that can effect ejection timing and pattern. What have you changed recently? Stock, ammo, scope mount?
Nothing different in the last 1000ish rounds.
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Originally Posted by Wasted ammo View Post
Sounds like an ammo issue to me, what are you shooting?
federal premium 308 sierra matchking bthp. 168gr.

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Old June 16th, 2017, 01:27 PM   #15
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Have the gas piston and plug apart right now. First time apart since I bought it from the store

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