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Posted: 8/5/2008 3:34:28 PM EDT
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I was out shooting my AR today (I had put a new LMT bolt/carrier group in it about a month ago) and it repeatedly failed to properly extract. The bolt carrier would slide forward to chamber another round while it was mashing a spent casing that was still hanging sideways out of the ejection port. I took the bolt/carrier out and removed the ejector. The ejector spring looked mashed in and it had a rubber O Ring around the spring with a rubber post in the center of the spring. I never saw anything like that. I showed it to the armorer at the range and he had never seen anything like this. We removed the O-Ring and rubber post, pulled out and reseated the ejector spring and the rifle started functioning properly. The only problem I have now is that the bolt doesn't lock open after the last round is fired. Does anybody have any ides what the rubber O-Ring surrounding the ejector spring and the rubber post in the center of the spring are all about? I sure would appreciate some insight. Thanks. |
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The extractor insert inside of the extractor spring has always been a component of the bolt group. The addition of the o-ring came about as of a few years ago. It was/is part of the Army’s SOPMOD program, and was designed to increase extractor effectiveness and reliability in the M4. ETA: www.bravocompanyusa.com/BCM-Extractor-Spring-Uprade-Kit-p/bcm%20extractor%20spring%20upgrade.htm |
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