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Posted: 1/28/2012 9:57:38 AM EDT
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I have an AXR that I havent fired on over a year. I stopped using it because I am always experiencing malfunctions. It doesnt seem to matter what type of ammo I use. The result is that it will stop firing and the bolt will be trying to close on two rounds going into the chanber. One fired on one unfired. Or I will have a fired round in the chanbber that the bolt did not extract. I would really like to shoot this thing with out constant malfunctions. Does anyone have place I could start to troubleshoot this thing?
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Quoted:
I have an AXR that I havent fired on over a year. I stopped using it because I am always experiencing malfunctions. It doesnt seem to matter what type of ammo I use. The result is that it will stop firing and the bolt will be trying to close on two rounds going into the chanber. One fired on one unfired. Or I will have a fired round in the chanbber that the bolt did not extract. I would really like to shoot this thing with out constant malfunctions. Does anyone have place I could start to troubleshoot this thing? Thanks. If working AUG A1 is available to test, I would try swapping parts with it to troubleshoot the problem. |
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I agree with Tomac, the problem sounds like a weak extractor spring or an extractor issue - the extractor will slip off the fired casing in the chamber when trying to extract, leaving it partially in the chamber, and then load a fresh round and wedge the two in there together.
My first MSAR did the same thing, and a new extractor spring fixed the issue with no problems since. I would clean the bolt and extractor throughly, and give it another try. I would also try the ammo you use and a different type of ammo just in case. You shoudl eb able to get an exatractor and spring at PJ Steyr AUG (AXRs use AUG bolts), and another option is to get a Ratworx hybrid bolt that uses an AR-15 extractor, the bolts run about $125 with the extractor and ejector installed and included. |
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Quoted:
I agree with Tomac, the problem sounds like a weak extractor spring or an extractor issue - the extractor will slip off the fired casing in the chamber when trying to extract, leaving it partially in the chamber, and then load a fresh round and wedge the two in there together. My first MSAR did the same thing, and a new extractor spring fixed the issue with no problems since. I would clean the bolt and extractor throughly, and give it another try. I would also try the ammo you use and a different type of ammo just in case. You shoudl eb able to get an exatractor and spring at PJ Steyr AUG (AXRs use AUG bolts), and another option is to get a Ratworx hybrid bolt that uses an AR-15 extractor, the bolts run about $125 with the extractor and ejector installed and included. I agree with both Tomac and Dawg, I had my STG do the same last year and I installed a new extractor spring and it was all better. No problems since. |
| Before you order parts, try cleaning the chamber really good with an AR chamber brush or something of equivalent size. If you shoot a lot of cheap dirty ammo (steel case stuff has caused this problem for me in the past), it has a tendency to gunk up the chamber with carbon, etc. which can cause an empty casing to stick good enough in the chamber that the extractor can't remove it. I speak from experience. |
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The AXR is built like a tank and needs less TLC than any other firearm I have had. I have owned 2 of them with 0 problems. You do need to follow normal firearm maintenance though. It sounds like an extractor issue - follow the advice here and let us know what you find out. |
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I took it out today and fired some PMC 55 grain fmj through it.
If I load one round the magazine charge the weapon and fire it throws the brass about 8 feet at the 4 oclock positon and bolt is locked back by the empty mag. This is with the gas regulator on the low setting - large hole. If I load one round the magazine charge the weapon and fire it with the gas regulator on the high setting - small hole showing the bolt locks back on the empty mag and the fired round is still in the chamber. When I remove the mag, let the bolt go forward then pull the charging handle back it extracts and ejiects the empty. If I load more than one round in the mag and fire wth regulator on the low setting the weapon fires and appears to extract the empty and the bolt picks up a round in the mag with out ejecting the fired round and tries to jam both the new round and empty into the chamber with the result of both empty and loaded round being bent and out of shape for lack of better words. The empty will be on top. I honestly do not know where to go from here. New extractor.......or that new bolt assembly with the ar-15 extractor or what? Any Ideas? |
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Sounds like your rifle isn't broken in yet. Try that same experiment w/full-power 5.56 (like Winchester Q3131A, available almost anywhere) w/the gas regulator at the low setting and I'll bet it'll function just fine.
If you want to use .223 (like the PMC 55gr) then run it on the high setting for a few hundred rds or try a couple of hundred rds of 5.56 at the low setting first before trying .223 again at the low setting. HTH... Tomac |
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You should never be getting spent casings left in the chamber whether the rifle is broken in or not. The break-in period is largely about getting the springs in the bolt carrier to soften up, and the issue most people get is slight short-stroking or failure to lock back on the last round. If your bolt is locking back, it's not short-stoking and it's cycling plenty far to eject that casing. So I would say this is definitely an extractor problem or chamber problem, and possibly an ejector problem.
Take a real good look at your extractor. Make sure the claw isn't damaged. If you don't know what it should look like, it's comparable to an AR-15 extractor. As for the o-ring fix, I've never messed with the extractor in my AXR, I don't know if the rubber o-ring for an AR-15 extractor will work or not. Also, take a real good look at the chamber with the barrel out of the receiver. It should be smooth and round. A spent casing shouldn't stick if you insert it. These guns run so much cleaner than DI AR-15's that it would be hard to imagine that the chamber is getting very dirty if you're using quality brass-cased ammo. I seriously see more brass fouling on my bolt than I do carbon fouling. The ejector is the pin opposite of the extractor inside the cup of the bolt face. It has a spring underneath of it. If you put a spent casing in the bolt face and push it against the ejector and then let go, the casing should be easily flung away by the ejector. |
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I would not rule out the gas port as being suspect.
It may be slightly oversize. The bbl isn't Steyr, and I believe neither is the gas block. If you open your gas up to much on an FAL, Wildey Pistol etc you will get the same result. Spent casings rolling on the top of the mag, dropping to the ground by your toes. |
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I think I will give the bolt assembly a good cleaning and check the extractor. I have shot less than 200 rounds through this thing. About the first 30 were trouble free. After that it has been nothing but problems. It's rare that I fire more that one round without a malfunction as described above.
I am afraid Dukpt may be correct. If it's overgasing maybe loading up some lower powered ammo would help determine for sure if its overgasing or not. |
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If I were in your predicament, I would give the following a try;
Detach your bbl when cold and drop a loaded HQ factory round into the chamber, then, tip the bbl towards the ground to see if it falls out. If it doesn't, then try taking it out with your fingers, it should come out with Little or no resistance. If this passes, do the same procedure, only now only with a Spent Casing FROM your AXR. The spent empty case may not fall to the ground on its own, but you should still be able to pull it out just using your fingers. Next, I would keep an eye out for members here that may live in your area that own a Steyr Aug. Try to contact and meet with one at your local range. Do some swapping around with each others complete group assemblies. Swap your complete slider assembly with his and vice verse, shoot some rounds. After this, and if your gun is still acting up, swap your parts to each his own again, then swap out your complete bbl assemblies. You're bound to catch it now, at least where you can narrow this down better. |
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