New Armalite AR-10 - Bolt doesnt lockback?

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11 years 10 months ago #16527 by OleCowboy
Replied by OleCowboy on topic New Armalite AR-10 - Bolt doesnt lockback?
So far everything you have described as the issue is the exact same problem I had, the bolt would not lock in the out of battery position with or without a mag or a loaded mag.

I called AR, had a tech on the fone and we went thru all kinds of tricks and nothing worked, he said you weapon is under warranty, ship it to us and let us look...as the stock I put on there is the same one used by AR.

You saw the pic, the stock, you may want to ask them about this or just ask for a return auth number and let them fix it for you. It won't quick but that is not there fault, blame Obammy for that.

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11 years 10 months ago #16552 by navajo
Replied by navajo on topic New Armalite AR-10 - Bolt doesnt lockback?
Had similair experence. Got a bubba-ed carbine, bolt would not lock back. Got it home and found a rifle length buffer in a collapsable stock. Easy fix.
Could still get parts then.

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11 years 10 months ago #16556 by j1mmyr1chter
Replied by j1mmyr1chter on topic New Armalite AR-10 - Bolt doesnt lockback?
Ok Charlie, I used a wooden dowel about 8" long to depress the buffer and spring into the tube. I measure about 3 and 15/16" of travel. It looks to me like I need about 4 and 1/2" of bolt travel for the bolt face to catch on the bolt catch. Can somebody confirm how much rearward bolt travel is needed for the bolt to lock back correctly?

Charlie wrote: If you can't lock the bolt back manually, and you can withdraw the BCG from the upper without interference when the upper is separated from the lower, then the buffer tube is the problem. I don't know what or how, but there isn't anything else behind the BCG!

Depress the buffer tube and see how far it goes (in inches). Then measure the distance the BCG extrudes from the open upper when it's in the locked-back position. Then go find the "dreaded previous owner" and beat him brutally about the nose and ears with a rolled up newspaper!

Charlie

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11 years 10 months ago #16560 by j1mmyr1chter
Replied by j1mmyr1chter on topic New Armalite AR-10 - Bolt doesnt lockback?
Thanks man. So whats weird is that the screw you showed is for bolting a stock to a tube (like a full length, or the magpul like you've got), but mines not like that. The tube is threaded on and staked, then the buttstock just slides over the tube, no bolt like yours at all. When I finally get to talk to Armalite again, I will ask them about it still, thanks for the guidance!

OleCowboy wrote: So far everything you have described as the issue is the exact same problem I had, the bolt would not lock in the out of battery position with or without a mag or a loaded mag.

I called AR, had a tech on the fone and we went thru all kinds of tricks and nothing worked, he said you weapon is under warranty, ship it to us and let us look...as the stock I put on there is the same one used by AR.

You saw the pic, the stock, you may want to ask them about this or just ask for a return auth number and let them fix it for you. It won't quick but that is not there fault, blame Obammy for that.

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11 years 10 months ago #16672 by mrraley
Replied by mrraley on topic New Armalite AR-10 - Bolt doesnt lockback?

j1mmyr1chter wrote: New to AR-10s. Just bought one and discovered that the bolt does not slide back far enough to lock back. Factory stock has been replaced by seller with retractable carbine stock. My limited knowledge, but diligent Armalite research leads me to believe that the correct buffer tube, buffer, and spring are present, but I could be wrong. Anybody seen this? What am I missing? I haven't fired the rifle yet, and don't plan to until I get this action issue sorted out. Thanks for any guidance!


Ok a lot of answers here are close but nothing hitting it on the head yet...

Answer these questions and I will be able to tell you exactly what or where you went wrong...

What is the inside depth of the receiver extension tube?
What is the length of the buffer spring?
What length is the buffer?
What is the weight of the buffer?

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11 years 10 months ago - 11 years 10 months ago #16674 by j1mmyr1chter
Replied by j1mmyr1chter on topic New Armalite AR-10 - Bolt doesnt lockback?

mrraley wrote:
Answer these questions and I will be able to tell you exactly what or where you went wrong...

What is the inside depth of the receiver extension tube?
What is the length of the buffer spring?
What length is the buffer?
What is the weight of the buffer?


Ok, here goes:

inside length of buffer tube is only 3 and 15/16" (I think I need about 4 and 1/2" of rearward bolt travel for this thing to work properly) ---- Clarification: the 3 and 15/16" measurement is not the full inside length of the buffer tube, its the amount of travel I measured when I used a dowel to push the buffer spring and buffer down into the buffer tube.

buffer spring is ~ 13" and Armalite says that the same spring is used for the carbine or the full stock

buffer is 3 and 1/4" in length

buffer is ~ 5 and 5/8 oz.

So, after some further discussions with Armalite, it appears that the buffer tube may be the problem. Armalite marks their AR-10 carbine tubes with a small circle just after the last adjustment hole in the tube. The one on mine does not have this marking. The seller is adamant that he installed the parts he received from Armalite for the stock conversion (I have confirmed with Armalite that he did in fact place the order through them). It would seem that if the seller is being honest, Armalite inadvertently shipped him the wrong buffer tube. I am waiting on a response from Armalite on this inquiry.
Last edit: 11 years 10 months ago by j1mmyr1chter. Reason: Clarification on inside length of buffer tueb measurement.

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11 years 10 months ago #16679 by mrraley
Replied by mrraley on topic New Armalite AR-10 - Bolt doesnt lockback?
This is almost what I was looking for... i was actually talking internal depth with nothing in the tube.

BUT...

For an AR-10 here is what you should have got.

Inside depth of the receiver extension tube is 7 5/8" deep
AR-10 buffer spring shoud be between 14" - 14 1/2" long.
AR-10 buffer is 5 3/16" and weight 5.4oz (rifle) 3 1/4" and weight 5.4oz (carbine)

So what this tells me, is that you picked up a inexpensive carbine set for an M-15 which has a depth of 6 15/16".

Notice the diferance in depth measurements? your missing a 5/8" of an inch.
The following user(s) said Thank You: OleCowboy, j1mmyr1chter

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11 years 10 months ago #16680 by j1mmyr1chter
Replied by j1mmyr1chter on topic New Armalite AR-10 - Bolt doesnt lockback?
I concur mrraley. Thanks for your analysis. Now my problem is trying to figure out who will make this right. The seller swears he used the parts he ordered direct from Armalite. If Armalite mixed up buffer tubes accidentally, then I would think they should get me the right tube. Will have to wait and see how the respond to my inquiry.

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11 years 10 months ago #16681 by BUILDING MY SASS
Replied by BUILDING MY SASS on topic New Armalite AR-10 - Bolt doesnt lockback?

mrraley wrote:

j1mmyr1chter wrote: New to AR-10s. Just bought one and discovered that the bolt does not slide back far enough to lock back. Factory stock has been replaced by seller with retractable carbine stock. My limited knowledge, but diligent Armalite research leads me to believe that the correct buffer tube, buffer, and spring are present, but I could be wrong. Anybody seen this? What am I missing? I haven't fired the rifle yet, and don't plan to until I get this action issue sorted out. Thanks for any guidance!


Ok a lot of answers here are close but nothing hitting it on the head yet...

Answer these questions and I will be able to tell you exactly what or where you went wrong...

What is the inside depth of the receiver extension tube?
What is the length of the buffer spring?
What length is the buffer?
What is the weight of the buffer?


Mrraley...
To the RESCUE... :dance:
It's about time you got back... :wave:
BMS
The following user(s) said Thank You: mrraley

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11 years 10 months ago #16682 by BUILDING MY SASS
Replied by BUILDING MY SASS on topic New Armalite AR-10 - Bolt doesnt lockback?

j1mmyr1chter wrote: I concur mrraley. Thanks for your analysis. Now my problem is trying to figure out who will make this right. The seller swears he used the parts he ordered direct from Armalite. If Armalite mixed up buffer tubes accidentally, then I would think they should get me the right tube. Will have to wait and see how the respond to my inquiry.


I would ask the "Seller" if he still has the Invoice...It may help things..or at least get his info and when he ordered it, it may also help...in trying to track it all down...
BMS

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