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AR 15 "stuck" bolt assy

This is a discussion on AR 15 "stuck" bolt assy within the M16 AR15 forums, part of the Rifle Forum category; Hello, Built my AR and it shoots straight and I love it. Has a problem ejecting rounds while trying to chamber a new round and ...


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Old September 16th, 2007, 12:54 PM   #1
Grunt
 
Join Date: Dec 2006
Location: California
Posts: 89
AR 15 "stuck" bolt assy

Hello,

Built my AR and it shoots straight and I love it. Has a problem ejecting rounds while trying to chamber a new round and I am getting a new extractor and spring soon but I have one major headache I was hoping you all might help me with.

If I pivot the upper from the lower to load my fixed magazine (California, ugh), after I shut and secure the upper again, it is impossible to pull the bolt back more than a 1/4". I must use the forward assist to force it back home and remove the magazine, reinstall the magazine, and then everything is just perfect !?

Anyone recommend a fix for this?

Thanks,
J


Last edited by jarheadteacher; September 16th, 2007 at 12:55 PM. Reason: grammar
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Old September 16th, 2007, 01:13 PM   #2
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Join Date: Jul 2005
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Is there adifference if this is done with the hammer in the cocked verses the fired position. The only thing I can think of is that the hammer gets stuck when closed if it is in the fired position.

Other than forcing the bolt forward and re-opening, what else to you do to solve the problem? Soltion can help in diagnosing problems.

Hope we can solve your problem.

jasonj

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Old September 16th, 2007, 01:43 PM   #3
Grunt
 
Join Date: Dec 2006
Location: California
Posts: 89
Thanks Jason and good troubleshooting idea, but, sadly, hammer cocked or uncocked, the problem occurs.

BUT, I just heard something. After pivoting the upper to recreate the problem, one must remove the magazine, pivot the upper, THEN I JUST NOTICED THE BOLT RELEASE BUTTON, ON THE LEFT SIDE OF THE LOWER, 'CLICKS' BACK INTO POSITION when you pivot the upper open. Then close the upper again and all is fine.

It seems to have somethnig to do with the bolt release button????

Hope this jogs someone's memory.

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Old September 16th, 2007, 04:55 PM   #4
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This must only be a problem with CA compliant AR's with the fixed mag. I have been playing with mine and holding the bolt stop engaged while opening and closing the upper and lower. I have even done this with an empty mag in place, this the bolt stop engaged when closing the upper but does not affect charging the rifle.

But I have a full auto, FA, carrier in mine, which is ramped from the rear and pushes the bolt stop down when I charge it. This might lead me to think that you probably have some form of AR-15 carrier, modified by manufacurers to prevent use in a FA gun, and to tie up the works if a semi gun goes FA. These were designed to do this, to prevent easily converting the gun to FA.

Can you place a dummy round in the mag and then chamber it? If so it sounds like it may be a carrier problem. You are allowed to use a FA carrier in a semi gun, by ATF, not sure about CA though. You would also need to change your firing pin. The flange on a semi pin is larger than on a FA pin.

That is the only thing that I can think of that would cause this to happen.

I have never seen the problem you describe after teaching numerous officers how to use the rifle, and being an armorer. Normally they can create every problem imaginable. :)

Hope this was some help to you.

jasonj

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Old September 20th, 2007, 02:33 PM   #5
Lifer
 
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Location: Upstate NY
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I had a similar problem. The bolt stop (the inside face to be exact) was interfering with the bolt carrier.

http://mywebpages.comcast.net/jesse99/AR_Carrier.html

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Old September 21st, 2007, 08:29 AM   #6
Grunt
 
Join Date: Dec 2006
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30 Cal,

I THINK YOU GOT IT !!!! I was just thinking that this week-end I should take the bolt stop out just to see how it functions and BAM! you send this great article....

I bet that is it and will share the results. It is SO frustrating for that to happen (jammed bolt) on a brand new weapon, and one that shoots so straight at that too.

Thank you, thank you, thank you....

J

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Old September 21st, 2007, 05:55 PM   #7
Grunt
 
Join Date: Dec 2006
Location: California
Posts: 89
30 cal,

You were correct. Came home from work, opened up the safe, got the AR out and took out the bolt stop...flawless operation....

Now I will grind the shiny parts off the bolt stop and reinstall.

Thank you so much.

You rinfo should go to a sticky post!

Semper Fi,
J

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