What causes this malfunction? Failure to eject. Pictures

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Roddy

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My 10.5" Norinco has been failing to eject spent casings completely. Depending on the ammo type it happens around every one in three to one in ten rounds. What happens is the spent casing partially extracts but fails to fully eject and the next round tries to get into the chamber and I end up with what looks like a double feed but with one live round and one spent casing.

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Those were two differant stoppages. Sometimes the extractor hold onto the casing and I can rack it out. Other times the live round wedges under it and I have to pull it out by hand. I also had one stovepipe.

What causes this? I have tried looking it up but mostly I find solutions for extractors that aren't grabbing and bolts that don't move at all. I was thinking it could be the buffer spring is too stiff or not enough gas is being used to drive the BCG as it looks to just be short stroking. I haven't cleaned the gas tube as I have never stripped the rifle down that far but if it helps I can.

Any ideas? New buffer spring might fix it? The BCG is aftermarket, can't remember what brand but better than Norinco, and it has bolted together aluminum handguards. Next time I am at the range I am going to try to see how far it ejects brass.
 
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short stroking, maybe a worn/broken ejector spring, take the bolt out, put a case into the bolt and see how far it flings it when you let it go
 
Take it completely apart including removing the extractor from the bolt and it will probably become obvious. If everything looks good then reassemble and lube it well and try it again.
If you're still having trouble next week we can try to arrange a day to meet and I'll have a look at it. I have to work the next 7 days.

Good luck
 
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Sorry it's hard to get a good picture of the extractor. When I put a piece of brass in it and hold the bolt in the same orientation as it is in the rifle it throws the casing about five to seven feet when I let it go if that indicates anything. I will tear down the BCG tomorrow and take a closer look.

I bought this rifle used and have only put about 300 rounds through it with the new BCG.
 
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Holleyman said:
Does the extractor grab an unfired round when chambered and extracted without firing?
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Yes. My friend recently used it in a 3 gun match where a live round was cleared out of the chamber on many occasions with no problems. That's what made me think the gun wasn't cycling properly.

I believe in the picture where the extractor isn't on the casing the extractor came off because the casing was hit hard and pinched by the live round trying to get into the chamber.
 
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polkey said:
The picture of your bolt looks like it has white powder on it, did you take the desiccant pack out of the bolt before firing it?
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It may just be the grease on the bolt combined with the camera flash but no I never took anything out of it. I will tear it down tomorrow and see what I find. That would be kind of funny if that was the problem.
 
I've seen this when lighter bullets (55g and less) were used in my shorter barrels. Seems like the speed of the bullet doesn't allow enough gas to get back and it causes short stroking. One thing that seemed to help for me was to only use 62g and heavier bullets in my short barrels. I was told to also use a HHH buffer, which I do, but that just seemed to lessen the frequency of the problem. Last thing, which I know isn't a problem for any of us, make sure the gun is firmly joined to your shoulder. If the stock is floating at all you are leaving a big energy bleed and you'll increase the chances of a stoppage. Good luck.
 
polkey said:
The picture of your bolt looks like it has white powder on it, did you take the desiccant pack out of the bolt before firing it?
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Dessicant pack in the bolt? What, in the firing pin hole? If you're taliking about the carrier then I doubt he would be able to assemble the two if there was something in there.

He's already said this rifle was bought used and he has put 300 rounds through it.
I suspect the extractor is worn or the ejector spring has broken.
Probably just needs a a new spring and o-ring for the ejector. Plunger spring sounds fine if it's flicking brass 5-7 feet just setting a piece in and letting it go.
 
Just throwing this out there... was the buffer and/or buffer spring been changed or "damaged" somehow. The weight of the buffer with combination on the density of the buffer spring can cause stroking issues (as mentioned by skunkydaniel) if the barrel was changed to a shorter one and/or gas bleed. I would take it to a certified gunsmith if issue persist.
 
Most all AR malfunctions i see at the range are caused by loose buffer tube castle nuts, from people putting sling mount plates on there and not tightening them enough and not staking the nut after .. Seen it happen so much i now keep a AR multi tool in my range bag.. Also Magpul BAD levers are junk and cause issues in many rifles , the bolt release was not designed to have a lever bolted on to it hanging off . Love Magpul and 99% of the stuff is great but BAD levers are a BAD idea... Also check your gas key nuts are tight and staked properly then inspect the bolt gas rings and gas tube.
 
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You said you threw a new BCG in there? Do you have the original? If you do put the original back in there to see if you notice a difference. You've got to do the process of elimination on this
 
Throttle_monkey1 said:
You said you threw a new BCG in there? Do you have the original? If you do put the original back in there to see if you notice a difference. You've got to do the process of elimination on this
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The original BCG does not go all the way forward. It hangs up for some reason, that's why I replaced it. I have another AR I could try the BCG from that.
 
Early 10.5 inch Norcs had weak extractor springs and did exactly the same thing, if you've ruled out ammo, and under lubrication (run your AR BCG wet) then rebuild your bolt (10 minutes and $10) and you shouldn't have any more issues. Also, if you replaced the BCG, did you replace it with a comparable one? IE not an early Colt SA, or a significantly lighter or heavier one?? 10.5 AR's need to be balanced - port size to reciprocating mass/buffer, spring etc.
 
Looking at the first pic, could have turned it sideways for us btw, it appears to be an issue with the bolt. The carrier moved back far enough to strip a round from the mag but before that it let go of the extracted round. You may or may not have further issues but as soon as the case mouth clears the port it should get ejected even in slow mo and not go back in the chamber, at least not often.
 
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