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  #1  
Old 03-01-2019, 08:31 PM
ScottS

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Pac-Lite constant FTE



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I have a Pac-lite upper on a Mark II lower. The gun has always been my "100% gun." Runs like a sewing machine. All ammo, all the time. Never had a problem, until recently.

Lately, the gun has turned into an FTE machine. I can't get through a magazine without at least one failure to eject. The resultant malfunction is always the same. They're almost mirror images. It manifests as seen in the attached pictures.

The gun has been run through the ultra-sonic cleaner. It's surgically clean. I installed a new ejector (Tactical Solutions Heavy Duty Ejector), and a new extractor and spring (Volquartsen Exact Edge Extractor). I even replaced the entire bolt with one from another Mark II that runs flawlessly. I ran through 16 different magazines today (a mix of factory and Mec-Gar), and had exactly two magazines that ran without an FTE. Federal Bulk-Pak (550 round maroon box), which has always been my go-to ammo in all my .22's. I even took ammo out of two different boxes.

It's driving me crazy, and the gun is essentially useless in its current state. I'm open to any ideas of what might be causing this, and thoughts on what to do next.

Help me, RFC-wan Kenobi. You're my only hope.
Attached Images
File Type: jpg IMG_8138.jpg (266.2 KB, 11 views)
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File Type: jpg IMG_8140.jpg (268.4 KB, 8 views)
File Type: jpg IMG_8141.jpg (291.6 KB, 8 views)
File Type: jpg IMG_8142.jpg (285.9 KB, 8 views)
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  #2  
Old 03-17-2019, 10:37 PM
Abigkidagain
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I am going to suggest a manufacture's defect in metallurgy. On brand new M1As, some break their extractors after three or four rounds. On the M14 website they have a list of parts you need to replace with USGI parts just to make your $2,000 rifle function.

I think the metal they used in yours may have just plain worn away. Such is life in today's gun world where parts are made out of melted down beer cans. It sounds like something in your upper may have merely worn away.
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Old 03-19-2019, 06:35 PM
jm10/22

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I'd contact the company, I have received great service from them in the past.
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Old 03-19-2019, 11:49 PM
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AzShooter
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I had this problem with my Mark III and the Tactical Solutions barrel. The extractor came loose. All it too to fix it was a screwdriver and some Blue Loctite. Hope this works out for you.
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Old 03-20-2019, 12:59 AM
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Have you changed the mag catch or made any mods to it? I have seen a couple posts with the same problem you have and the fired case was hitting the top of the mag knocking it off of the extractor before it got back to the ejector to be kicked out of the ejection port.

You said you put a new extractor and ejector in the gun and it does it with different mags so that should eliminate them from the cause. Plus you changed the bolt out for another.

I would check the position of the mags to see if they are setting up a little higher than they used to.
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Old 03-24-2019, 01:38 PM
ScottS

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Quote:
Originally Posted by AzShooter View Post
I had this problem with my Mark III and the Tactical Solutions barrel. The extractor came loose. All it too to fix it was a screwdriver and some Blue Loctite. Hope this works out for you.
The extractor? Or the ejector? I can't imagine using loctite on the extractor.
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Old 03-24-2019, 01:44 PM
ScottS

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Quote:
Originally Posted by bubba68 View Post
Have you changed the mag catch or made any mods to it? I have seen a couple posts with the same problem you have and the fired case was hitting the top of the mag knocking it off of the extractor before it got back to the ejector to be kicked out of the ejection port.

You said you put a new extractor and ejector in the gun and it does it with different mags so that should eliminate them from the cause. Plus you changed the bolt out for another.

I would check the position of the mags to see if they are setting up a little higher than they used to.
In order to eliminate the mag release as a possible cause, I swapped another Mark II lower in, and produced exactly the same result.

I'm beginning to think the cause might be related to the chamber. It seems like the cases might be "slow" to extract, and the ejector doesn't have a chance to kick it free before the bolt catches the expended case. I'm thinking maybe a burr or something in the chamber is causing too much drag on the case. I'm going to try some JB Bore Paste to polish the chamber and see if that helps at all.

Beyond that, it's a real head-scratcher.
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Old 03-24-2019, 03:22 PM
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Quote:
Originally Posted by ScottS View Post
The extractor? Or the ejector? I can't imagine using loctite on the extractor.
I meant the ejector. Sorry.
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Old 12-01-2019, 06:01 PM
linux_author
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found this thread as i was having the exact same problem with my Pac-Lite on a MKIII lower... one lad on-ine suggested that the chamber was too 'sharp,' resulting in bad feeds.. he offered that a slight polish of the chamber edge (a very minute chamfer) helped him...

so i tried it on my Pac-Lite 4.5 barrel... i used a light, angled sanding of a toothpick-sized tight roll of 400-grit wet-or-dry, followed up with a polishing of the chamber using a fleece swab...

it worked! failure to extract (stovepipe) went down to 1 out of 200 using Winchester M-22s and CCI SV LRN... the barrel still doesn't like Aguila Super Extra...

this is unlike my MKIII stainless upper on a MKII lower and MKII stainless - both those eat ANYTHING fed into them...

i'm calling the problem as due to the chamber..... i would normally suspect magazine problems, but the magazines (i have 12 of 'em) work flawlessly on my other MK IIs and the MK III frame with MK III upper

i think Tactisol has some issues that are long un-resolved, as i've read about this problem dating back more than 10 years...

unfortunately, Tactisol is the only solution if you want an inexpensive threaded barrel...

i'm leaving my other stainless MK III and MK II (threaded) barrel as my target pistol.. the Tactisol is just now a 'fun gun' with my suppressor...

willie
on the Gulf of Mexico
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  #10  
Old 12-03-2019, 03:59 PM
ScottS

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What a coincidence.

I haven't been back to this thread, and that's bad on my part.

After eliminating/replacing almost every conceivable part, and repeated general cleaning (including ultrasonic), I decided the problem was in the chamber. The expended round was just not flying out of the gun. Something was slowing it down, and I figured it was a problem with drag in the chamber. I took a bore fleece swab and some JB Bore Paste and chucked it up in my drill. Ran the fleece at medium speed with lots of paste to polish the "innards" of the chamber. Back in the ultrasonic to get paste out, and the gun now runs 100%.

It sounds like we came the same conclusion; the chamber was the problem. It certainly solved my problem.
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