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Feed Issues, Rock-ola James River Armory

This is a discussion on Feed Issues, Rock-ola James River Armory within the Modern M14 forums, part of the M14 M1A Forum category; Originally Posted by KurtC I suspect the action simply isn't getting enough power. 1. The gas cylinder isn't lined up correctly. 2. The spindle valve ...


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Old April 19th, 2017, 05:14 PM   #16
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Quote:
Originally Posted by KurtC View Post
I suspect the action simply isn't getting enough power.

1. The gas cylinder isn't lined up correctly.
2. The spindle valve is dirty or not fully open.
3. There is a grooved piston in it.
4. The gas plug is loose.
5. The ammo was not designed for an M14.

As stated above. Insert a loaded magazine, pull the oprod handle all the way to the rear and release it. Repeat. If each round chambers and extracts, then it is one of the issues I mentioned.
Can you please explain the issue with a grooved piston? I'll go over that list tomorrow.
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Old April 19th, 2017, 06:26 PM   #17
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The piston was not designed to have a groove in it. If you rifle has one in it and is short stroking than put a standard piston in it problem solved. The groove was meant to make high power loads with heavy projectiles easier on the rifle/oprod.

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Old April 19th, 2017, 06:31 PM   #18
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sadlak piston explanation
http://sadlak.com/si_rifle_parts_pistons.html

who made the bolt?
also note what round number in the magazine that this happens


Last edited by POLACK; April 19th, 2017 at 08:29 PM.
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Old April 19th, 2017, 06:37 PM   #19
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Can you please explain the issue with a grooved piston? I'll go over that list tomorrow.
Thanks
The grooved piston was intended to reduce gas port pressure when using slow powders to push heavy bullets. If using standard M80 grade ammunition, it lowers the port pressure below what is needed to send the bolt all the way to the rear. If the bolt doesn't go all the way to the rear, it doesn't strip the next round from the magazine.

3 o'clock ejection is typical of a commercial barrel.

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Old April 19th, 2017, 07:49 PM   #20
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in the ar series,feed issues in most cases was solved by an extractor kit upgrade.

for this issue,i would remove bolt,check all sharp edges around extractor/ejector holes,completely strip bolt and clean it inside and out,and replace all springs with new made extractor/ejector. cheaper way to go to begin.
if orig gi bolt used,it might be original springs.which may be weakened due to being old and compressed for so long. you never know if older gi springs were used or newer production springs were used. orig gi springs are 40 plus years old.

then check and see if the problem persists.

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Old April 20th, 2017, 09:07 AM   #21
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i stripped bolt completely, extractor lost in my shop. Cleaned everything. Ordered new extractor, springs. The inside of the piston was badly carboned. I thought the Sadlak tool was actually drilling into steel. A lot of carbon was removed. Checked gas valve, gas hole alignment.
Bolt is SA 7790188 SA ZIC
Barrel is Bula Forge 7790190 Chrome lined
OP rod HRA

Do you think the issue was the carboned up piston interior?

Thanks

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Old April 20th, 2017, 09:19 AM   #22
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i stripped bolt completely, extractor lost in my shop. Cleaned everything. Ordered new extractor, springs. The inside of the piston was badly carboned. I thought the Sadlak tool was actually drilling into steel. A lot of carbon was removed. Checked gas valve, gas hole alignment.
Bolt is SA 7790188 SA ZIC
Barrel is Bula Forge 7790190 Chrome lined
OP rod HRA

Do you think the issue was the carboned up piston interior?

Thanks
You're most likely not getting enough gas, so that is a possibility. Most M80 type ammo uses crappy ball powder, which burns dirty. Make sure the piston is bone dry after cleaning. The only grease in the gas system is on the gas plug threads.

Make sure you clean out the spindle valve as well.

Thanks from leonmckee and Rich D
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Old April 20th, 2017, 09:19 AM   #23
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Quote:
Originally Posted by masspatriot View Post
i stripped bolt completely, extractor lost in my shop. Cleaned everything. Ordered new extractor, springs. The inside of the piston was badly carboned. I thought the Sadlak tool was actually drilling into steel. A lot of carbon was removed. Checked gas valve, gas hole alignment.
Bolt is SA 7790188 SA ZIC
Barrel is Bula Forge 7790190 Chrome lined
OP rod HRA

Do you think the issue was the carboned up piston interior?

Thanks

Carbon buildup in the gas system would do it.

Thanks from leonmckee
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Old April 20th, 2017, 09:49 AM   #24
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bolt tool garand/m1a
https://www.amazon.com/Garand-Bolt-A...words=m14+tool

if your going to disassemble using butt stock tool,do it inside a pillow case.if you slip,parts wind up in case,not everywhere

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Old April 20th, 2017, 10:08 AM   #25
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I think Kurt is spot on in his train of thought!

I strongly recommend you upgrade your piston to a Sadlak Titanium Nitride Coated piston or Bula Black Nitride piston. Also, I would encourage you to test with Federal GM308M Gold Medal Match 308 ammo just to establish a baseline.

Leon McKee

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Old April 20th, 2017, 10:50 AM   #26
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Did you clean out the gas piston's interior cavity?

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Old April 20th, 2017, 02:11 PM   #27
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Did you clean out the gas piston's interior cavity?
Yes sir. It was really loaded, As I said earlier, I thought I was actually removing metal. It was loaded with carbon.

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Old April 20th, 2017, 02:23 PM   #28
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I think that will solve your problem. That little hole in the tail of the piston so to speak is hard to get clean. As mentioned above buy a box of FGMM if that doesn't cycle the rifle has another issue.

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Old April 21st, 2017, 03:10 AM   #29
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I think that will solve your problem. That little hole in the tail of the piston so to speak is hard to get clean. As mentioned above buy a box of FGMM if that doesn't cycle the rifle has another issue.
Same here, the tail of the piston is the first to get carbined up and the hardest to get clean.

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Old April 21st, 2017, 03:51 PM   #30
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Same here, the tail of the piston is the first to get carbined up and the hardest to get clean.
here's what was removed
Attached Images
File Type: jpg IMG_1869.JPG (149.1 KB, 26 views)

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