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Old 02-19-2011, 06:40 PM   #1
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Default Need advice

I have recently purchased a Bushmaster XM15-E2S from a local FFL dealer. I am having some issues with it missfeeding and locking after emptying the magazine. This is what I have done so far.

1. i've tried replacing the magazines from the standard military issue mags to a PMAG. Still doing it.

2. I've tightened the magazine catch. Still doing it.

3. I've checked the bolt gas rings to insure they are 120degree offset from each other. Still doing it.

4. I've lubed the bolt and bolt carrier and all inside correctly. Still doing it.

I allowed one of the knowledgeable FFl dealers to inspect it and they said it might be the ramp on the star chamber is to rough and needs to be polished. Nearest gunsmith wont be in till next week. any other ideas on what could it be before i spend money on it getting fixed?

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Old 02-19-2011, 06:44 PM   #2
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Is the Carrier Key on the Bolt Carrier tight? Is it used or new?

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Old 02-19-2011, 06:52 PM   #3
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I bought the weapon used from the dealer.

yes the carrier key is on tight.

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Old 02-19-2011, 07:00 PM   #4
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TX

As you know it is hard without seeing the rifle. Just as a wild guess you might check the carrier key inside to see if someone might have cleaned it with a Q-Tip and got some inside. Believe it or not it happens and then when the gun is fired the cotton material turns black and you can not hardly see it. Obviously you must have just got the rifle. And if you did it probably had that problem is the reason they traded it in unfortunately. But I hope that was not the case. If you just got it I would go back to the dealer for repair on him or your money back. There are a multitude of things if could be. When you put an empty magazine in and pull the charging handle back will the bolt carrier lock back? I will stay here with you on the Forum!

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Old 02-19-2011, 07:16 PM   #5
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One other quick check TX!

Take the Bolt Carrier out. Pull the Bolt out to its furthest extended position. Then set it with the Bolt on a flat surface with the Bolt Carrier in a Vertical position. If the Carrier falls down on the Bolt you may have a Gas Ring problem? Also check the strength of the Ejector by pushing it in and out. Then the Extractor by pushing it outward. If either seem weak that would certainly cause the problem with the ejection but should not cause the Bolt to not lock back.

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Old 02-19-2011, 07:16 PM   #6
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Yes the bolt carrier locks back.

photo-2-.jpg   photo-3-.jpg   photo-5-.jpg   photo-7-.jpg   photo-8-.jpg  

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Old 02-19-2011, 07:18 PM   #7
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pictures continued of chamber

photo-10-.jpg  
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Old 02-19-2011, 07:23 PM   #8
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both ejector and extractor have great strength when i apply pressure.

photo-11-.jpg  
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Old 02-19-2011, 07:24 PM   #9
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Looking at the pictures:
1. Have you tore the Bolt Carrier down all the way and cleaned the carbon off the tail shaft of the Bolt
2. Be sure the Locking Lug area of the Barrel Extension is clean where the feed ramps are and inside behind them. It seems like I see some brass?
3. But it may be deceiving iin the picture but the Carrier Key just does not look right in the picture. Is it jagged and not uniform around the Carrier Key hole as it looks?
Which brings me to the point if it is damaged it has in all probability worn the Gas Tube end that is supposed to have a flared end on it. If you could send a better picture of the Carrier Key and Gas tube inside that would be helpful.

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Old 02-19-2011, 07:27 PM   #10
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I missed the most simple question! Have you tried ohter magazines?

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