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Posted: 9/9/2012 2:34:28 PM EDT
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About ready to throw this thing down the driveway in frustration.
So I put together an all-DPMS LR308. All parts are either new or very lightly used, but all are DMPS brand and stock for this rifle. BCG is new, I'm using a 7.62x51 chambered barrel I got off the EE with something like 200 rounds fired through it. This thing simply refuses to extract correctly. At first, it wouldn't chamber OR extract. It appeared to be an out-of-spec extractor, so I replaced that, and most of the problems went away. Still didn't chamber correctly (wouldn't go completely into battery), but would extract better, so I replaced the spring and buffer to ensure I had new and correct parts there. That seemed to solve the out-of-battery problem. Now, it'll cycle correctly while firing, but I cannot manually extract a round. It's so tight that if I want to unload the rifle, I have to beat the buttstock against the workbench while pulling on the charging handle. I have Forster's go and no-go gauges in .308, it closes on the go and doesn't on the no-go, so I don't think it's an overly tight chamber. Chamber doesn't look rough, either, and the cases are sticking BEFORE firing, so I don't think that's the problem. What's the next step in the troubleshooting flowchart? |
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Quoted: Possible but not always. Pictures of cam pin bolt and bolt carrier please.Quoted: Have you blacked out(with a Sharpe) a in spec round to see if it is binding or getting stuck in the barrel lands? Yep, and it's not. Plus, if it were in the lands, wouldn't I have pulled a bullet or two in the process? (Which I haven't.) |
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While I go find my camera and tear apart the bolt, here's some backstory.
Old thread on the previous problems. |
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Quoted:
Yeah you should throw it down the driveway, what's your address? ^ 
But in all seriousness, take a look at the barrel extension area for burrs and rough spots...there should not be wear marks of that type with a new or nearly new bolt, since it does not seem to be a over tight chamber or short throat...you may have to take a good look at the extractor and remove it if neccesary making sure it does not bind at some point during cycling. Good Luck. |
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