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Posted: 4/4/2012 8:40:19 AM EDT
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Hey guys,
I am having an issue with a round firing, spent casing not ejecting and next round being fed and subsequently jammed. Is this an exctractor issue? Is this considered a double feed if the first round is actually loaded correctly and fired? Please advise. Matt |
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not a double feed your topic name is correct failure to extract. a double feed would be two live rounds trying to feed.
There are a few things that can cause a fail to extract as I was so fortunate to find out with my gun show bargain bin upper. Are the cases getting stuck in the chamber and the rim is getting sheared off by the extractor? check the tension of your extractor should be pretty stiff dissassemble bolt and check extractor spring and insert oring. Look inside your chamber if it looks like myne below it could be an issue but don't expect a mirror finish. 
That should put you well on the way to at least eliminating some things if not solving it. also what ammo? do you have a 556 or 223 chamber? |
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Thanks for the response. The bolt is cycling and when I pull the bolt back both the spent casing and next round fall out. I have a 5.56 chamber and have been using the same American Eagle ammo as I always have. I detail stripped the bolt and lubed it up. I think it may have been a laziness issue not cleaning it the last few times out.
Matt |
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I don't know much about this area... but I'm curious here (and hopefully someone with experience knowledge can tell me).....
If you pull the bolt back, the spent round ejects (as expected) AND the next round comes flying out too (while the bolt is still back).... Then wouldn't this be an issue with the magazine itself not stopping the next round at the top of the mag? Maybe I misunderstood what's going on... |
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Is it not ejecting or not extracting?
When you fire it, look at the BCG, is it going all the way back or only partially extracting the case? Is the case being fully extracted, but not ejected? If it doesn't extract, remove the extractor and check the spring and insert. How many coils on the spring? What color is the insert? Also, push on the ejector. Is it firm and moving freely or is it weak? Who is the manufacturer and what ammo are you using? Once you answer those questions, we should be able to help you better. Meanwhile, ensure the bolt key is tight and staked. |
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I am not sure if it isn't extracting or ejecting. After I fire the round and pull the trigger again I see what looks to be a casing inside the chamber, another round angled up trying to be fed into the chanber with the bolt half way closed holding them that way. I clear it by simply releasing the magazine, pulling back the charging handle and the spent casing and additional round fall out of the mag well.
This is what I am trying to determine is whether it is an extractor or ejector issue. Matt |
| doesn't sound like ejector in that case or it wouldn't jam the next round in to the back of the first it would try to chamber both the empty and the live round. If your extractor lip was dirty enough it could cause that but also likely to be your spring insert lack thereof |
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Single round in a mag, mag inserted with the round charge (leaving an empty mag in the well, fire for effect and first confirm that the rifle is full stroking correctly, and the bolt locking back.
From there if the bolt is locking back on the mag catch when the rifle goes dry, they pull all the way back on the charging handle and confirm that the face of the bolt does not retract back past the back edge of the ejection port. Lastly since cleaning seems to be coming in play here, make sure to clean the chamber of the barrel with a chamber brush by hand (no drill) using CLP as the cleaning products (brush is going to do all the work, with the CLP just breaking down the grit to allow it flush out or the chamber more easily. If after all of this, still have problem with the spent case being dropped, then install a #60 O ring around the extractor spring to add more tension to the extractor so the spent case is not dropped on the rear pull. |
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As the previous poster describes check your parts carefully.
Take the bolt out, remove the extractor by pushing out the little pin, be careful not to lose the extractor pin or spring. The # 60 O ring is a trick to increase tension on the extractor. Check the groove under the extractor where it catches on the casing. Make sure it's clear of obstructions. Should have a little groove on it. If you choose to install the O ring it goes over the extractor spring. From there, check your ejector. Take a small punch, stand your bolt on a block of wood and make sure the ejector can be pushed flush with the bolt face, actually a little below flush is my preference. Clean and check the chamber extremely well. I had to polish a chamber with a barrel mop and some flitz using a cordless drill. Only takes about a minute. I found mixing ammo is not a good choice. But I have made a jam o matic function with tula. |
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Quoted: I am not sure if it isn't extracting or ejecting. After I fire the round and pull the trigger again I see what looks to be a casing inside the chamber, another round angled up trying to be fed into the chanber with the bolt half way closed holding them that way. I clear it by simply releasing the magazine, pulling back the charging handle and the spent casing and additional round fall out of the mag well. This is what I am trying to determine is whether it is an extractor or ejector issue. Matt Sounds to me like it's short stroking. What's happening is that the BCG isn't travelling far enough back for the fired round to eject, the round in the magazine is already angled up slightly, the bolt lugs hit it but instead of sliding over it, they push it part way up, keeping the bolt from traveling fully forward. If you're using steel cased ammo, try some brass case. Wolf/Tula/etc. are well known for being weak. If you're already using brass cased ammo, try using a lighter buffer. If your buffer doesn't have any H marks on the face, it's probably already the lightest buffer you can get. Putting a couple hundred rounds through the rifle might get the spring to set enough to run with the ammo you're using. If none of that works, you'll need to have your gas port opened up. |
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I am having the same issue with a 6.5 Grendel AR. After firing 6 - 10 rounds almost every round would stick in chamber after firing, the bolt would cycle with the empty stuck in the chamber and a new round jammed into the stuck case. I polished the chamber and put a DFender around the extractor spring. Last trip out I had only 1 case get stuck out of 48 rounds fired. I polished the chamber some more and it did look like the chamber in the picture above when I started but is smoothing out. I had a lot of issues with wolf ammo. I also used Hornady ammo which worked a lot better with fewer issues. The wolf was very dirty and I suspect it was fouling the chamber after a few rounds. In my case it seems to be several factors, ammo, rough chamber and weak extractor spring. The extractor also had sharp edges which i smoothed out with emery cloth.
Ken |
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Quoted:
I am having the same issue with a 6.5 Grendel AR. After firing 6 - 10 rounds almost every round would stick in chamber after firing, the bolt would cycle with the empty stuck in the chamber and a new round jammed into the stuck case. I polished the chamber and put a DFender around the extractor spring. Last trip out I had only 1 case get stuck out of 48 rounds fired. I polished the chamber some more and it did look like the chamber in the picture above when I started but is smoothing out. I had a lot of issues with wolf ammo. I also used Hornady ammo which worked a lot better with fewer issues. The wolf was very dirty and I suspect it was fouling the chamber after a few rounds. In my case it seems to be several factors, ammo, rough chamber and weak extractor spring. The extractor also had sharp edges which i smoothed out with emery cloth. Ken I polished out that chamber with a 5/16 dowel emery cloth and a drill also added o ring to extractor haven't had another jam and the brass is coming out almost perfectly smooth now. I think I overdid the polishing just a little as now I get a small bulge in the case at about the opening of the chamber but it is small and goes through a sizing die pretty easily. |
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Some people say not to use emery cloth on the chamber. That's why I used flitz and a mop. Made a huge improvement in extraction.
Sometimes playing with heavier buffers can help remedy the problem also. Plus the heavier buffer is totally reversible unlike emery cloth. The reasoning behind the heavier buffer is it slows the unlock time to give the case a little more time to "release" from the chamber walls. Good luck, |
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