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Posted: 5/15/2009 5:01:32 PM EDT
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I've been breaking in the barrel on a new AR and am finding the spent cases are failing to eject. When I place a dummy round in the chamber and hand crank the bolt the round comes straight out. The gun's got an adjustable gas block so I am wondering whether this needs adjustment. Not sure whether this is a symptom of being over gased or under gased. Any views?
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If this happens when you cycle the action manually.... it isn't a gas issue at all... Disassemble your rifle, lubricate the ejector... Work it up and down with the base of a cartridge. What kind of rifle do you have? Edit: NVM, You're saying it works when cycling manually, I misunderstood. What exactly is happening to the casing when it fails to eject? Stove pipe, jammed against the barrel extension, back into the chamber, etc.? |
| I'm currently loading one round at a time because I am breaking in the barrel. After I pull the trigger, the bolt locks back on the empty mag and the case comes out of the chamber, but it doesn't get ejected out of the gun. The case just ends up sitting loose on top of the empty mag. |
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Check to confirm that the ejector is not binding in the bolt. Use a spent cases off the extractor and prong it in a few times.
Next, add a #60 O-ring around the extractor spring. This will insure that the spent case is not dropped from the bolt face during the rearward stroke while the chamber breaks in. About the time the O-ring starts to fall apart, is should no longer be needed. |
| A weak or defective extractor spring can cause the ejector to fail.. The case must be held tight enough with the extractor while the ejector unloads and does it job. A weak or defective extractor will allow the ejector to just push the case forward and drop it in the action.They must work together correctly to get the action cleared.Try and move the extractor with a screwdrive or punch. It should take some good pressure to move it. Not easlily. Take the extractor out of the bolt and make sure the plastice bushing is inside the spring.. That bushing is essential and is often lost when assembly and disassembly occur.If missing ejection and or extraction will be unreliable. |
| PS.. cycling the action by hand does not always indicate the true problem .The forces involved in gas cycling as opposed to hand cycling are very different , I have seen actions that will cycle perfectly by hand and not by gas operation.But it is somewhere to start. |
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