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Help! Bolt carrier stuck!


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#21 OFFLINE   DrBob

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Posted Nov. 13 2010 - 10:24 PM

Can you remove the firing pin retaining cotter pin?


Yep. got the cotter pin and firing pin out no prob.
The cam pin rotates but the bolt will not rotate or move back.


BTW, when you say misfired. what happened? Nothing, or whas it an out of battery firing?


I think what happened is the bolt never fully seated because the bolt never rotated into position in the bolt carrier so the cartridge never fired. I ejected the unfired cartridge.

Should I try beating on the bolt with a rubber mallet?


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#22 OFFLINE   TomJefferson

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Posted Nov. 13 2010 - 10:41 PM

Did you mix CLP and another oil?

That can setup like glue. Solvent and relube if you did.

Tj


#23 ONLINE   Gmountain

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Posted Nov. 13 2010 - 10:43 PM

Should I try beating on the bolt with a rubber mallet?

You might try tapping it.


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#24 OFFLINE   DrBob

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Posted Nov. 13 2010 - 10:45 PM

Ok, here's the latest:
I did beat on the bolt and I was able to remove the cam pin. However now I cannot get the bolt out of the carrier. It does turn, but very difficultly and I cannot pull it out. I did take this apart before I fired it once so i know I could do it originally. I am guessing there is something wrong with the rings. Any suggestions on how to get this apart? or is it starting to look like it is time for a new bolt or bolt carrier group?


#25 ONLINE   Gmountain

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Posted Nov. 13 2010 - 10:48 PM

Ok, here's the latest:
I did beat on the bolt and I was able to remove the cam pin. However now I cannot get the bolt out of the carrier. It does turn, but very difficultly and I cannot pull it out. I did take this apart before I fired it once so i know I could do it originally. I am guessing there is something wrong with the rings. Any suggestions on how to get this apart? or is it starting to look like it is time for a new bolt or bolt carrier group?

You could let it soak overnight in some Breakfree.


#26 OFFLINE   DrBob

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Posted Nov. 13 2010 - 11:33 PM

I think it is time to call CMMG.
I don't think a bolt carrier group should fail after just 75 rounds.
That just ain't right.
Thanks to all who replied to this thread!


#27 ONLINE   jchtrh

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Posted Nov. 14 2010 - 03:38 AM

Sounds like your gas rings failed, they might be broken and preventing the bolt from coming out or you have a blown primer jammed in there somewhere. I would try to push the bolt back in and see if that frees anything up.


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#28 ONLINE   jchtrh

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Posted Nov. 14 2010 - 03:39 AM

Also you might want to check your upper where the gas key runs in the channel. If your cam pin was stuck and you force the carrier to move, this may have caused damage to the inside of the receiver.


#29 OFFLINE   Warlike

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Posted Nov. 14 2010 - 05:18 AM

ok it should take a buttload of crap getting into the BCG to get it stuck like you are experiencing, I can only think of two things that could have it stuck, your rings have moved and badly or your BCG was out of tolerance horribly from the MFG (I doubt this one it's too rare and you should have noticed something when you disassembled and reassembled the BCG prior to firing so I'm betting on the rings), grab the bolt behind the lugs with a set of pliers and lever it out of the BCG, then check the rings


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#30 ONLINE   Seanhagerty

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Posted Nov. 14 2010 - 08:36 AM

I would be very reluctant to put tools on this at this point. A new rifle should not have these problems. I would definately contact CMMG and talk to them. I would bet they will get you fixed in a flash. If not then you can investigate other options.

Sean


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#31 OFFLINE   Ken67

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Posted Nov. 14 2010 - 11:47 AM

Take it back. You paid good money. CMMG needs to fix it not you.


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#32 OFFLINE   rbakis

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Posted Nov. 15 2010 - 11:15 AM

Your extractor pin and/or extractor may be broken causing the jam. The spring tension from the extractor spring on an extractor not captured by the pin binding on the inside of the carrier may be the culprit.


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#33 OFFLINE   DrBob

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Posted Nov. 15 2010 - 12:06 PM

I contacted CMMG. They said to ship the whole upper back to them and they will repair or replace it. I will keep you all posted on what happens.
Thanks for all the replies!


#34 OFFLINE   bob72

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Posted Nov. 15 2010 - 12:13 PM

I contacted CMMG. They said to ship the whole upper back to them and they will repair or replace it. I will keep you all posted on what happens.
Thanks for all the replies!



Can not wait to here the out come :thumb:


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#35 OFFLINE   Danny45

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Posted Nov. 15 2010 - 09:16 PM

If you have to use the "mortar manuever" and you have a collapsible stock, should the stock be extended, or collapsed?


And no, I don't have a stuck BCG or anything. The thought just popped into my head and it's always good to know these things beforehand.

Edited by Danny45, Nov. 15 2010 - 09:17 PM.



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#36 OFFLINE   Derk_digler24

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Posted Nov. 16 2010 - 04:50 PM

BTW, when you say misfired. what happened? Nothing, or whas it an out of battery firing?

curious about that to. is there anything in the barrel still or was thier a double feed? :CONFUS12:


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#37 OFFLINE   DrBob

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Posted Nov. 16 2010 - 10:08 PM

The upper is on it's way back to CMMG. I will let you know when I hear back from them.

I think what happened is that the bolt got stuck in the carrier so the bolt could never lock the round into the chamber. So it actually did not fire. The round never got fully chambered. So nothing ever got stuck in the barrel. NO double feeds. The barrel is clear.


#38 OFFLINE   mothergreen

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Posted Nov. 16 2010 - 10:50 PM

stock should be fully collapsed. if its extended it can loosen up the fit of the stock.


#39 OFFLINE   Warlike

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Posted Nov. 18 2010 - 07:58 AM

stock should be fully collapsed. if its extended it can loosen up the fit of the stock.


also can bend and even break the the pin that locks the stock in place, mortaring should not take alot of force in most cases, the way I do it is to jerk the charging handle just slightly before bumping the ground with the stock and continuing through with pull on the charging handle, if I don't get more movement of handle repeat the mortar technique. The way I guage the force is to hold the stock roughly two inches from the ground and I will usually only use the mortar technique after trying to jerk the handle with the buttstock against my thigh a few times first.


#40 OFFLINE   rman43

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Posted Nov. 18 2010 - 08:09 AM

To the OP:

I think you will be pleased with CMMG's customer service. I've had dealings with them in the past and they are second to none - fast, courteous and will do whatever it takes you get you running again.

Tom





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