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Posted: 7/5/2014 7:04:40 PM EDT
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Today I was shooting a build i recently put together and had some issues extracting the spent cartridge. The gun fired fine, but when the bolt came back it was leaving the cartridge in the chamber. Upon inspection of the spent case, I noticed the lip of the case had a nick in it where the extractor sort of scraped it or it maybe tore a small (very small) part of the lip, leaving the cartridge in the chamber. When using a cleaning rod to get out the spent case, it came out effortlessly. I've fired this barreled upper many times before (it came on my Sendra when I got it, so lots of full auto) and never had an issue. At first, I thought it had a sticky chamber so I cleaned the chamber but that didn't help. The bolt career group MIGHT be a recent replacement. I just can't remember because I've bought so many parts in the last year and a half. So, maybe the bolt has a bad extractor or extractor spring? What would cause the lip of the cartridge to sort of rip like that? For what it is worth, this happened with both IMI and Wolf today. Both before and after scrubbing the chamber.
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Pull and check the extractor and the extractor spring on the bolt.
http://www.ar15.com/content/guides/parts/bolt.html If the spring is still seem strong (large coil side of the spring installs in the extractor channel side), and the extractor grab claw is still sharp, then install a #60 O ring around the extractor (should be able to buy a #60 O ring for about a dime at any hardware store). If the spring is weak (from lots of full auto fire that over heated the extractor spring), or the extractor grabbing claw worn, then replace the worn part. |
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Quoted: Sendra kit? It was likely overgassed to start with. What kind of buffer are you running? The BCG probably came from AIM when they had a cheap deal on BCGs for like $90 a while back. The LPK is PSA. The upper receiver came from M&A parts (I think) The receiver is Aero Precision. The stock set up and buffer is unknown origin. I don't have any spare extractor springs or extractors, so that is why I think it would just be easy to remove the bolt, stick it in a zip lock with a note so I know it has issues, and then install a Colt or FN bolt I have. |
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