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Malfunctions in M1a "Loaded"

This is a discussion on Malfunctions in M1a "Loaded" within the Modern M14 forums, part of the M14 M1A Forum category; So I recently acquired an older model M1a "loaded", it was full of GI parts and dated to 99'. Stock was in terrible condition but ...


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Old March 28th, 2020, 12:47 PM   #1
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Malfunctions in M1a "Loaded"

So I recently acquired an older model M1a "loaded", it was full of GI parts and dated to 99'. Stock was in terrible condition but everything else appeared to be good to go. I refinished the stock which turned out great, got a unitized gas cylinder, clearanced the handguard, and scrubbed the gun clean. I mounted an A.R.M.S. #18 mount on it and a good optic. Went out to shoot at the range 3 weeks ago. I fired 60 rounds. Accuracy was fantastic, I was getting one jagged hole at 100 yds with a sled. But out of that 60 rounds the bolt and op rod disconnected 4 times. By disconnected I mean, the bolt would remain back after ejecting the casing and the op rod would remain forward. It also caused a wear in the parkerization, above the rear of the track. I'm guessing from my limited knowledge that the op rod may be out of spec and is allowing enough movement for the bolt to come out. I contacted SA and they sent me a shipping label. I mailed the rifle off to them about a week and a half ago now. Anyone experience this issue before?

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Old March 28th, 2020, 12:50 PM   #2
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check op rod tab that slides into the slot on right side of receiver. may need a new op rod or have tab repaired. check for bent oprod

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Old March 28th, 2020, 12:52 PM   #3
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Did you happen to notice if the roller was still on the right lug of the bolt?

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Old March 28th, 2020, 01:04 PM   #4
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Looking forward to SAI's diagnosis and repair. They are good people and used to fixing broke things.

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Old March 28th, 2020, 03:48 PM   #5
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Roller is still in place and op rod is still in the track, just forward. I'll keep everyone updated on what S/A says.

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Old March 28th, 2020, 04:34 PM   #6
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Quote:
Originally Posted by mwf203 View Post
Roller is still in place and op rod is still in the track, just forward. I'll keep everyone updated on what S/A says.
There's always a chance that a previous owner switched oprods, putting on one with a very worn tab.

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Old March 28th, 2020, 05:33 PM   #7
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I would guess the op rod is out of spec allowing to much play... I diagnosed some unusual wear on an op rod and receiver (similar to yours just above the track) to a misaligned op rod guide. I straightened the guide and replaced the op rod. I still need to send the old op rod off for a retab.

I’m sure SAI will hook you up. I think it’s awesome that they’ll fix a 20 yo rifle. Excellent company.

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Old May 9th, 2020, 03:54 PM   #8
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I sent it off to Springfield and they found the op rod to be out of spec. Replaced it with a brand new one. They were fantastic. Now it's back to running like a sewing machine and as accurate as ever.

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Old May 9th, 2020, 05:40 PM   #9
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I had a similar problem once, SAI rebent the oprod and gave me a new gas cylinder.

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Old May 10th, 2020, 06:11 AM   #10
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Quote:
Originally Posted by mwf203 View Post
I sent it off to Springfield and they found the op rod to be out of spec. Replaced it with a brand new one. They were fantastic. Now it's back to running like a sewing machine and as accurate as ever.
Nice to see that they took good care of your problem.

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