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Mini-14 Extractor ( Warning, Large Pics! )

This is a discussion on Mini-14 Extractor ( Warning, Large Pics! ) within the Ruger Semi-Auto forums, part of the Rifle & Shotgun Forum category; Rifle was bought NIB ( 580-999XX). Fired 60 rounds. When I cleaned and Inspected the Rifle, I found what looked like chewed up extractor plunger ...


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Old June 16th, 2009, 09:52 AM   #1
 
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Mini-14 Extractor ( Warning, Large Pics! )

Rifle was bought NIB ( 580-999XX). Fired 60 rounds. When I cleaned and Inspected the Rifle, I found what looked like chewed up extractor plunger and the Extractor Face severely scraped up. The Breech looked good. I called Ruger and they are shipping me the replacement parts.

What do you think? Anything in the Receiver I should look for? A quick check of the Receiver did look good.








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Old June 16th, 2009, 12:59 PM   #2
 
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What ammo were you using?
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Old June 16th, 2009, 01:42 PM   #3
 
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55 gr WWB FMJ................
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Old June 16th, 2009, 02:13 PM   #4
 
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Looks like a foreign object somehow got into the action while you were firing. Something hard like a piece of steel or a bit of grit. It would take a closer inspection to give a more educated opinion though.

Any signs of something coming off in the action maybe? This could happen on a faulty casting in a new gun. Ruger's quality control should have picked that up however.

Althoough the major damage looks like it is on top, it could have been caused by an obstruction below the bolt, (or on top in the final stages of the backward motion of the bolt) in the reciever.
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Old June 16th, 2009, 02:54 PM   #5
 
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I'll do a more thorough inspection of the Receiver for burrs and casting marks. But something ate up the Extractor plunger..............
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Old June 16th, 2009, 04:44 PM   #6
 
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Internet diagnosis is rather difficult, but these pictures are exceptional quality, and I believe tell the tale.

THIRD PIC down
Notice the bright spot on the extractor. Also, notice the scratch(?) That appears to begin at the end of the extractor and runs the entire length of the surface, and then back, and both are curved.

Second PIC down
The bright wear line at the top. Apart from the beginning of this line, it is straight and relatively the same width. Also, at the beginning of this same line, the wear pattern is almost at a 90 degree angle to the line itself. This is wear when the bolt is rotates and locks. The thin line is when the bolt is moving in and out.

Notice the second wear line. Almost exactly the same, apart from where the bright spot on the extractor towards the rear. It appears that on the forward movement of the bolt, bits of the damaged bit of extractor is being shaved off and being caught between the two surfaces. The real tell tale sign of this is at the end of the line, there is a thin scratch that appears to end in a blob (tiny). These lines are being made when the bolt is traveling forward or closed.

Now, the question is: Is the mark on the extractor the result of the ejector fouling the receiver on the bolts rearward travel, or tool marks damage. It could be either.

Now we move down the extractor plunger. While one might suppose this may have been caused by some sort of debris, I don’t think so. If you compare the direction of the scratch marks at the plunger, it is easily seen that they do not match the direction (straight) as the marks discussed above. The marks on the plunger are defiantly tool marks, the tool slipped and created the curved scratches, both forward and backward. Those curved lines MUST be straight to be anything else but tool marks.

Just my 2 cents.

Chris
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Old June 16th, 2009, 05:44 PM   #7
 
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Hey Varmitor, all 2 cents much appriciated! They do add up

I inspected the Receiver and found no burrs or heavy casting lines, no unusual wear marks.

I did fail to mention that when I first look at the Bolt, the was some shiny metal bits around the Plunger area. I disassembled the Extractor ( What a PITA! ) and the Plunger is chewed up pretty bad.
The Plunger is knotched to fit the knotch in the extractor and what I found is if you take the Plunger and lay it knotch down on the edge of the extractor, it fits the wear pattern on the Face ( Breech end ) of the Extractor( Pic 1 ) Somebody mucked with this, either at the factory or the Gun Shop. The Knotch in the extractor has a good size burr and it was pushing the Extractor up above flush from the Bolt top a little bit................

I'll try to take some detailed Pics of the Receiver, maybe ya'll see something that I missed.................

Am I getting Mad.....No
Am I keeping my Mini..........YES!

Last edited by Chief_10Beers; June 16th, 2009 at 05:46 PM.
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Old June 18th, 2009, 06:39 PM   #8
 
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Cudos to Ruger, Parts came in today! Fast and curtious service! I'll see how everything goes this Saterday................
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Old June 21st, 2009, 02:26 AM   #9
 
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Hey Chief 10 Beers,

I hope its 10 quarts and not small ones!
Any news on the extractor yet? I'm dead curious as to what the situation is with the new parts!
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Old June 23rd, 2009, 05:28 AM   #10
 
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Question

Ok, here'the skinny,

The new Extractor has a defect as the knotch that the Extractor Plunger fits into was not Milled right, it was cut too high up on the Extractor. I ended up dressing up the old Extractor, reassembled with the old Extractor, new Plunger and Spring. I found and dressed down a nasty burr in the Receiver.

I took the Mini to the Range to set my dope up. I fired 100 rounds and had 2 FTFires ( Dud rounds ). The Rifle shot great but the top of the Bolt is still rubbing against the Rounded portion of the Receiver. It's a real smooth wear, like someone took a fine Crocus Cloth to it........

Not sure what I'm going to do at this time. The Rifle Shoots Great, is a accurate shooter, but not match grade ( about the same as the M16A1 I used to tote around in the Marines). AFAIK it could be normal. I'm going over to a co-workers house and check out his Mini as he has about 1000 rounds thru his................
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