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Mark III Extractor

This is a discussion on Mark III Extractor within the Gunsmithing forums, part of the Firearm Forum category; Just a quick question. I have noticed that the extractor in my Mark III will not hold a case against the bolt face worth a ...


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Old June 7th, 2008, 08:44 PM   #1
 
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Mark III Extractor

Just a quick question. I have noticed that the extractor in my Mark III will not hold a case against the bolt face worth a darn, pretty loose actually. I know this isn't a 1911 but is this normal?

Oh, I'm checking this with the bolt out of the gun.




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Old June 8th, 2008, 05:04 AM   #2
 
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Most Ruger rimfire bolts have a headspace around .050+. If you take that down to .043-.044 the extractor well hold the case tight. I'm sure there are other opinions on this.
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Old June 8th, 2008, 06:38 AM   #3
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The solution is very simple. Either file your factory extractor like this or buy an Exact Edge extractor. This Ruger design is exactly the same in the 10/22 ... even uses the same part. 90+% of all extraction problems are related to the funky extractor design. It's round nose sits in a channel beside the chamber (cut into the barrel). Because of the shape of the nose, the extractor totally cams off the case rim when the bolt is closed. When the gun is fired, sometimes the case is not retained well so when the case head hits the ejector, it doesn't flip out of the receiver. There's only room enough for one case so you end up with a jam. By filing the extractor's head, it will sit in the channel but will have full contact with the case head. No more slipping off and jamming.


Last edited by Iowegan; June 8th, 2008 at 06:42 AM.
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Old June 8th, 2008, 09:23 AM   #4
 
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Iowegan, I get exactly what your saying and it makes perfect sense. The issue I'm asking about is if the extractor will actually grip and hold a new round against the bolt face firmly, like all of the centerfire autos I have had apart. Or am I just wasting my time being concerned about this?

About the headspace comment, how does one "take down" the headspace on a Mark III anyway? I'm not sure I understand what you mean.

Thanks for the help so far!
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Old June 8th, 2008, 01:08 PM   #5
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Bullitholz, Headspace is the gap between the case head and the bolt. With a spring loaded blow back semi auto, it's hard NOT to have zero headspace. Because the firing pin has a throw limit, any headspace more than a few thousandths would cause misfires from light hits. I think what madcratebuilder was referring to is when a round is placed in the bolt, there's quite a gap between the extractor hook and the front of the case rim. That's perfectly normal, in fact if the gap is not generous enough, the extractor won't get a good grip on the rim.

The only time an extractor really extracts is when you manually pull the bolt back. The name "extractor" should really be changed to "holder" in a blow back semi-auto. What most people forget is the pressure inside the chamber blows the case AND the bolt back at the same time. The extractor does not extract at all, rather it's job is to hold the case in position until the rim hits the ejector and flips the case our of the receiver.

No, a Ruger MK series or a 10/22 keeps a "loose" hold on the case ... not like a centerfire pistol or any 22 except a semi-auto. No cause for alarm. If your having failure to extract problems, just shape the extractor as above and your Ruger will eat any brand of high velocity 22s without a single malfunction.
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Old June 8th, 2008, 04:54 PM   #6
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Ruger's extractor design actuall has two flaws. First is the way the flat extractor contacts the rim. A 1/4" chainsaw file works great for making the contour.



Next is a graphic that shows how both the factory and modified extractors fit in the slot of the barrel. Note: when a round is fired, the factory extractor can slip off the case rim whereas the modified extractor starts with a better grip and holds the case until ejected.

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