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Posted: 6/27/2008 1:07:39 PM EDT
| Please let me know if anyone has a cure to this problem. I have a lightly used AMD 65 built by CIA. I took it to the range yesterday and after the 7th round I started having failures to extract. I took it home, thoroughly cleaned everything with break free, sanded some of the surfaces underneath the bolt. I then compared the AMD parts with the Hungarian parts. I noticed that the gas piston for the AMD is a 1/2 inch shorter than the Romanian. Is this normal or could this be the problem? Today, the same problem even though I changed ammo from Norinco to Golden Tiger and also changed mags. Please let me know if you have any suggestions. |
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Try stripping the extractor from the bolt. Clean it and lube with the dead dino product of your choice. Why were you sanding the receiver? AK armorer's manual can be downloaded here: www.box.net/shared/wfnjbu204s BSW |
| Thank you and I'll give it a shot. I"m kinda new with AKs and I wasn't aware that if you pull the handle back slowly, the bolt carrier will stop half way over the hammer. I assumed it was sticking on the hammer, so I sanded both parts down a little. Luckily I stayed away from the receiver and only removed the grit on the hammer and under the bolt carrier. If anything, the hammer sure looks nice and shiny. |
Dude, before you go sanding on stuff, meet with a local AK guy or 20 and talk it over. |
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The sticking when you slowly work the action is normal. The bolt carrier isn't meant to be operated like that. Don't do anymore sanding. AMD gas systems are often a shorter gas system than other AKs. The piston on those will be shorter. My SA-85M has the short system. |
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Some questions: Is this an AMD65 with standard barrel and extension muzzle brake to make 16 inch barrel length or the longer barrel with AMD MB? If you have a standard AMD65 barrel it uses a shorter gas tube and piston to match the shorter barrel. When the failure to extract occurs is it difficult to pull the bolt carrier back? Does the case extract with the bolt if retracted by hand? Is the empty case being left in the chamber? Since you are not discribing a feed jam I assume this is not the case. Two things which could be tried: 1) Field strip and remove gas tube, clean the gas port hole into the barrel, could be filled with gunk. Most likely if failing to extract but able to pull bolt carrier and able to extra case. 2) Clean bolt head under extractor, verify spring tension, if leaving case in chamber. |
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This is the AMD with the standard barrel and extension muzzle break. When I have a failure to extract, it is difficult to pull the bolt carrier back. The case does not extract if the bolt is retracted by hand. The empty case does remain in the chamber. Thank you for the input! |
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Pretty much only 3 possibilities to get the symptoms you describe: 1) The extractor is dirty, damaged or its spring is underpowered. Clean and/replace as necessary. Take you new replacement extractor and spring to the range so you can swap them out there to test. 2) Something is wrong with your ammo. Try some different brands and report back. Try both steel case and brass. 3) You have a damaged chamber. Chamber is pitted or ringed. Either way, it's new barrel time. Send that rifle back to the guy you bought it from. Post pics of the extractor, extractor spring, fired brass, and chamber. Chamber pic may be hard to get. BSW |
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Another possibility is the chamber may also be dirty or have some old dried cosmoline that intermittently effects extraction. Since you can not easily extract by hand it is most likely the chamber. I have seen some bolt issues with the camming surfaces of the bolt but that would normally be after the case is partially extracted. I would not write off the barrel just yet, try a good brass brush and solvent in the chamber area and see if it improves extraction. The extractor is not a problem if it is not leaving the case in the chamber while the bolt and bolt carrier goes back. Sounds like after you fire a round the action is not able to pull the case out of the chamber but is not just leaving it in place. The AK has generally plenty of force on the gas piston to work the action so it all comes down to the chamber. |
| Problem resolved--the pin holding the hammer in place was too short. The short pin allowed the hammer to move around, sometimes high where it made contact with the bolt carrier as it was extracting the casing. A longer pin now keeps the hammer in place. I guess CIA was running low on pins the day this AMD was built and decided to use one that was set aside. Thanks for everyone's input! |
| Yes. After shooting a few rounds, the hammer would shift up barely touching the bolt carrier and causing it to stop. When I cleared the jam, I guess the hammer was pushed down to where it was supposed to be, but moved up again when I started firing. I couldn't tell this was happening because the indoor range I was shooting at is not well lit. |
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