AR15.Com Archives
 AR-15 not ejecting
tel0004  [Team Member]
7/29/2010 7:09:51 AM EST
I have an AR-15 that is brand new, I built it myself. It won't eject a round, so the new one gets loaded in, and it causes a double feed.

I took my friends Bolt carrier group, put it in my rifle, and it fired fine, so something is wrong with my (LMT) BCG.

When the bolt carrier group slams back, the round is firmly seated, and locked on, so would you assume its the extractor?

I'm not really sure what to do or what to look for?

Thanks for the help.
Paid Advertisement
--
87GN  [Team Member]
7/29/2010 7:13:22 AM EST
It won't extract, or it won't eject?

Extracting is pulling the case out of the chamber, ejecting is flinging it out of the rifle.
tel0004  [Team Member]
7/29/2010 7:15:49 AM EST
It will not eject.
locke12  [Member]
7/29/2010 7:24:29 AM EST
Have you checked the ejector to make sure it is moving freely?
tel0004  [Team Member]
7/29/2010 7:35:54 AM EST
Originally Posted By locke12:
Have you checked the ejector to make sure it is moving freely?


I don't know how to do that, so I haven't checked it.
locke12  [Member]
7/29/2010 7:55:35 AM EST
Originally Posted By tel0004:
Originally Posted By locke12:
Have you checked the ejector to make sure it is moving freely?


I don't know how to do that, so I haven't checked it.


Pull the bolt group, and using a dummy round or spent case, engage said case into the bolt face by hooking the case lip under the extractor claw, and pivot it against the ejector. It should have resistance and move freely.
Gatorhunt  [Team Member]
7/29/2010 8:01:50 AM EST
Here is a picture...number seven is the extractor, number six in the ejector.
So, using a spent case, hook it into the extractor, and confirm that the eject is moving without binding in the bolt face channel (just a lot of spring tension on the ejector). It could be that the ejector is binding, or just not enough spring tension on the extractor causing the problem.

Lastly, we need to know if you fire only a single mag loaded round, will the bolt lock back on the bolt catch when the empty mag is left in the rifle for that shot.


aceranch  [Member]
7/29/2010 8:14:11 AM EST
Have you pulled the bolt from the carrier recently? Is the ejector on the correct side?
Dano523  [Moderator]
7/29/2010 8:24:37 AM EST
Originally Posted By aceranch:
Have you pulled the bolt from the carrier recently? Is the ejector is on the correct side?


Seeing that problem more now since some manufacturers are not penning the bottom of the cam channel in the bolt, and you are able to install the bolt with the ejector inside the receiver on the carrier.
Gatorhunt  [Team Member]
7/29/2010 9:12:07 AM EST
Originally Posted By Dano523:
Originally Posted By aceranch:
Have you pulled the bolt from the carrier recently? Is the ejector is on the correct side?


Seeing that problem more now since some manufacturers are not penning the bottom of the cam channel in the bolt, and you are able to install the bolt with the ejector inside the receiver on the carrier.


That never even crossed my mind. ETA .. are they doing that to be able to use them in right and left handed BCG .. an ambi bolt?

Thanks for the edit ... you made me sound like I knew what I was taking about.

Dano523  [Moderator]
7/29/2010 9:57:08 AM EST
Really don't have a clue why the are not penning the bottom cams on the bolts. Just know that when you could only install the cam in the one side, didn't have to look at which direction the extractor was facing.

No worries on the edit, we both know you meant to type it anyways, but hit the submit button too fast.
tel0004  [Team Member]
7/29/2010 11:21:47 AM EST
The bolt is installed on the correct side. Its designed so it can not be installed backwards

I have totally taken it apart, and checked to see if it was put together correctly, but the ejector doesn't seem to move at all. How much should it move?

I had the failure to eject, tried my friends bolt carrier, then got home, took the BCG apart and reassembled it, and tested it out with snap caps.
Looking at the design, gas is required to eject the brass. Am I correct in this assesment. If so, then it will never properly eject snap caps, and I need to go to the range to see if I fixed whatever the problem was. Is this correct?

My thinking was to not bother taking it to range until it was ejecting, but I guess there is no way to eject rounds without live ammo.

locke12  [Member]
7/29/2010 11:48:23 AM EST
Originally Posted By tel0004:
The bolt is installed on the correct side. Its designed so it can not be installed backwards

I have totally taken it apart, and checked to see if it was put together correctly, but the ejector doesn't seem to move at all. How much should it move?

I had the failure to eject, tried my friends bolt carrier, then got home, took the BCG apart and reassembled it, and tested it out with snap caps.
Looking at the design, gas is required to eject the brass. Am I correct in this assesment. If so, then it will never properly eject snap caps, and I need to go to the range to see if I fixed whatever the problem was. Is this correct?

My thinking was to not bother taking it to range until it was ejecting, but I guess there is no way to eject rounds without live ammo.



No, spring tension is what ejects the brass. Did you try working the ejector, and working some lube into it (part of the normal cleaning procedure)? If you chamber a snap cap, pull back on the charging handle...it should eject.

EDIT: Look carefully at the picture Gatorhunt posted, and look at the face of your bolt...at rest, the ejector should be projecting about 1/8" from the recess in the bolt face (or is it stuck down in there i.e. flush). Let me know what you find.
Kekoa  [Member]
7/29/2010 11:57:25 AM EST
Originally Posted By tel0004:
..........but the ejector doesn't seem to move at all. How much should it move?


The ejector spring is very stiff, but the ejector should telescope fully below the face of the bolt, when you press on it.

altopwescap  [Member]
7/29/2010 12:05:14 PM EST
Actually the ejector pin ejects the casing and your snap cap. I would check the ejector and ejector spring. Gas in the carrier rotates the bolt, gas from the barrel blows the casing and BCG rearward. Your weapon should eject without gas.
Gatorhunt  [Team Member]
7/30/2010 12:59:05 AM EST
Just for some clarity ... sorry to keep asking the same questions.
So it's not ejecting but is extracting?
Is it completely extracting the round from the chamber but just not tossing it out of the rifle?

OP .. here is a picture of a bolt ..



where the red circle is at is where the spring is located that pushes the extractor into the bolt face if you press that rounded end of the extractor while pulling on the area where the blue circle is at it should pivot slightly .. not much but it should move a little. Also like locke12 said the extractor should protrude slightly into the bolt face like this.

ETA for another picture


You can see in the picture that the hook of the extractor protrudes slightly into the bolt face if it's not then it's possible some foreign material got under the extractor preventing it from seating into the bolt properly. Would help if we had some pictures of your bolt face and side where the extractor is located.
tel0004  [Team Member]
7/30/2010 4:09:11 AM EST
Thank you for all the help. The last post is what got it for me. On my bolt, I am apparently missing my ejector



I can stick my firing pin in 1 inch with no resistance, so its not hitting anything

Looking at this diagram, I'm missing parts 4,5 and 6



locke12  [Member]
7/30/2010 4:26:24 AM EST
Originally Posted By tel0004:
Thank you for all the help. The last post is what got it for me. On my bolt, I am apparently missing my ejector

http://img30.imageshack.us/img30/6080/24335018.png

I can stick my firing pin in 1 inch with no resistance, so its not hitting anything

Looking at this diagram, I'm missing parts 4,5 and 6

http://www.mapartsinc.com/products/1507105454_01c%20003.jpg



That would explain it.
87GN  [Team Member]
7/30/2010 4:32:13 AM EST
Well, that wasn't very nice of whoever put the bolt together.
Gatorhunt  [Team Member]
7/30/2010 7:21:56 AM EST
Originally Posted By 87GN:
Well, that wasn't very nice of whoever put the bolt together.


This...

and glad you got it figured out.
tel0004  [Team Member]
8/3/2010 4:31:38 PM EST
Got the required parts today, installed it, said a few choice words while installing it, and it ejects now. 3.00 to change a single shot gun into a semi automatic. I'm happy.

Next upgrade will be a BCM charging handle. I assume that upgrade will be a bit easier.
MillerSHO  [Member]
8/3/2010 5:44:46 PM EST
Just keep at it.

Before you know it a few years have passed and you'll know the platform inside and out.
Pretty simple design when it comes down to it.
Paid Advertisement
--