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Posted: 7/16/2007 3:43:19 AM EDT
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Well, that fixed the extraction problems. Run 300 rounds through it without any issues. It's that stronger spring with 5 coils in it, the little rubber donut (O-ring) and the black plastic thing that goes in it instead of blue. Also tried replacing with the stock extraction parts and that improved it but still had an occasional jam. I wonder if there is a bigger underlying problem, why the stock parts suddently stopped working. On the other hand, the tension is so high, I have to squeeze the bolt with pliers to remove the extractor pin. |
Underlining problems with either the extractor it's self going south, the chamber now rough or not correctly cleaned (last of the chamber cut before the throat), or the barrel gas port plasma eroded to the point that now the action is now over cycling (would take tens of thousands of round to get to this point, so you should be able weed this out as the problem). |
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Here is what happened. I've had it for a number of years without issues and suddently, it started having Failure-To-Extract. With all ammo, all mags. First, I replaced the extractor parts with identical stock extractor parts. Meaning the spring, the blue plastic insert into the spring (there was no rubber O-ring) and the extractor itself. The old extractor didn't look bad to me. The FTE problem almost went away and instead of one jam every 5 rounds, I got only one FTE per session (200 rounds). I thought that 1/200 failure rate was still too high and some kind of problem was still there and replaced the extractor spring with the upgraded stronger spring plus I installed the O-ring. That's when the FTE issue completely went away. Looks like it is a necessary reliability upgrade on every AR. This one is as plain jane as they get. Also it didn't have that many rounds through it, maybe 3K at most in its lifetime. (I think some ppl burn that much ammo in a week) I will try cleaning the chamber part better but I thought I got it pretty clean before. |
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A quick check after you have cleaned the chamber/bore is to chuck up a 30 cal CLP soak mop on a few section of rods, then drill spin the wad into the chamber deep and back out a few times. If the wad is coming back fouled, you are missing the last of the chamber cut section when you are cleaning the barrel by hand with the chamber brush. But no worries since you can use the soaked mop to get at the last bit of fouling that can build up over time every few cleaning when needed. P.S. Don’t drill spin the chamber brush/wire brushes in the chamber. The chamber brush should only be used by hand turning. |
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