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post #1 of 33 (permalink) Old 02-28-2010, 06:52 PM Thread Starter
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AR wont remove spent shell

Well I went from a 16" setup to a 20" and now it wont remove the spent round. I kept everything on the lower the same. On the upper though I have a DD M16 bolt carrier. I think that has something to do with it, but I am just guessing.

What could be my problem?

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post #2 of 33 (permalink) Old 02-28-2010, 07:05 PM
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Well I went from a 16" setup to a 20" and now it wont remove the spent round. I kept everything on the lower the same. On the upper though I have a DD M16 bolt carrier. I think that has something to do with it, but I am just guessing.

What could be my problem?
Headspace is wrong.

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post #3 of 33 (permalink) Old 02-28-2010, 07:14 PM
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Clogged Gas block/Tube??

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post #4 of 33 (permalink) Old 02-28-2010, 07:25 PM Thread Starter
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Originally Posted by Dacotua View Post
Headspace is wrong.
How do I fix it?

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post #5 of 33 (permalink) Old 02-28-2010, 07:29 PM
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I highly doubt the head space is wrong. What size buffer and spring are you using? Also what brand ammo?

What you might call solitude is something i look forward to.
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post #6 of 33 (permalink) Old 02-28-2010, 07:38 PM Thread Starter
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I highly doubt the head space is wrong. What size buffer and spring are you using? Also what brand ammo?
I tried Monarch soft point, fmj, and Federal. I have no clue What buffer I have. and spring. How do I find out? I have it pulled out so I can identify it.

I had a friend watch the bolt carrier slide back and it only goes halfway.

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post #7 of 33 (permalink) Old 02-28-2010, 07:42 PM
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I would check the gas carrier key. The gas port on the upper. Why it would be clogged if its new good question. I've got my money on a blocked port or a big leak somewhere.

What you might call solitude is something i look forward to.
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post #8 of 33 (permalink) Old 02-28-2010, 08:33 PM
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How do I fix it?
You have to have a headspace gauge. Put it in the gun and measure it.

If your barrel isn't screwed on all the way (Like one turn off, it will allow the shell to go fully seated, and not allow the bolt face to go over the rim of the shell and engage the extractor.).

The reason I think you have a headspace issue, is that you just only switched barrels. Something isn't aligned correctly.

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post #9 of 33 (permalink) Old 02-28-2010, 08:42 PM
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I would check the gas carrier key. The gas port on the upper. Why it would be clogged if its new good question. I've got my money on a blocked port or a big leak somewhere.
GAS key blocked... also a good idea.. Check the way the rings are stacked also.. could be letting too much gas to escape, with not enough pressure to send the BCG back.

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post #10 of 33 (permalink) Old 02-28-2010, 09:02 PM Thread Starter
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You have to have a headspace gauge. Put it in the gun and measure it.

If your barrel isn't screwed on all the way (Like one turn off, it will allow the shell to go fully seated, and not allow the bolt face to go over the rim of the shell and engage the extractor.).

The reason I think you have a headspace issue, is that you just only switched barrels. Something isn't aligned correctly.
I used a completely different upper. I didn't just switch barrels.

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post #11 of 33 (permalink) Old 02-28-2010, 09:27 PM
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I used a completely different upper. I didn't just switch barrels.
WHEN you manually cycle the gun, will it eject a round? (If NO, then you have a headspace issue or a Bolt issue/extractor issue.)

If the answer is yes, it will cycle, then you have a gas system issue.

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post #12 of 33 (permalink) Old 02-28-2010, 09:38 PM
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I would say try. 5.56 ammo . I purchased a ar that would not cycle a new round after being shot. A guy from the range sid use this ammo. and it cycled like crazy until it got to the .223 ammo. the 5.56 has a higher head pressure
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post #13 of 33 (permalink) Old 02-28-2010, 09:45 PM
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If there is a question on headspace, I wouldn't voluntarily go up to a round that has a higher pressure. BOOM BITCH.
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post #14 of 33 (permalink) Old 02-28-2010, 10:07 PM
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What size buffer and spring are you using?

What im wondering. Carbine to Rifle lenght gas system? The pressures at the gas ports are twice as much for carbine than rifle. You buffer system may be to heavy.
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post #15 of 33 (permalink) Old 02-28-2010, 10:15 PM
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What im wondering. Carbine to Rifle lenght gas system? The pressures at the gas ports are twice as much for carbine than rifle. You buffer system may be to heavy.
Very true.. But enough to stop it from cycling??

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post #16 of 33 (permalink) Old 02-28-2010, 11:55 PM
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If you swapped uppers it could be any of the following

Clogged gas tube Fix use a LONG pipe cleaner to push down the tube and clean it out or you can remove the front sight block and use compressed air to blow the tube out

Clogged carrier key Fix Remove carrier from upper strip it (bolt, firing pin...) use compressed air to blow from the front of the key (dog leg piece with the hole in it) any clog will blow out the inside of the carrier

Gas rings miss aligned or worn out Fix Check with the bolt fully extended in the carrier (in position to put back in the rifle) set it bolt face first on a table if the carrier slides down the bolt and closes the rings are worn out and need to be replaced. also check to make sure the gaps in the rings (should be 3 of them) and not aligned Ideally you want them evenly spaced around the bolt. I also put a dab or oil on my rings just a drop find they wear slower that way.

Carrier is dragging on the lower Check/fix make sure there is no abnormal wear on the lower at the buffer tube. since you are running a new upper the bolt carrier may be touching the lower and causing it to slow down as it comes back only fix for this would be fitting or replacing the upper

Wrong buffer/spring Fix some 16" uppers will have a large gas vent and use a heavy buffer 20" barrel needs a standard weight buffer Only way I can tell you to check this is compair it to other buffers

That's all I can think of now
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post #17 of 33 (permalink) Old 03-01-2010, 12:02 AM
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New uppers do this sometimes, I've seen it happen a few times. Although everyone's suggestion is valid, I think this is something a little more simple.. when you say it won't remove a spent round, do you mean the spent case is stuck in the chamber, or the BCG returns but the extractor does not grab?
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post #18 of 33 (permalink) Old 03-01-2010, 12:04 AM Thread Starter
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Originally Posted by Dacotua View Post
WHEN you manually cycle the gun, will it eject a round? (If NO, then you have a headspace issue or a Bolt issue/extractor issue.)

If the answer is yes, it will cycle, then you have a gas system issue.
Its hard as fuck but when I pull back it spits it out.

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post #19 of 33 (permalink) Old 03-01-2010, 12:06 AM
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Its hard as fuck but when I pull back it spits it out.
does it not cycle each time you fire it, or is this periodic? When you say it's hard as fuck, do you mean the spent case locks in the chamber and then when you pull on the charging handle it suddenly breaks free and ejects?
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post #20 of 33 (permalink) Old 03-01-2010, 10:37 AM
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Its hard as fuck but when I pull back it spits it out.
If it's "HARD AS FUCK" by hand cycling the gun, it sounds like the chamber of the barrel isn't cut correctly. It's too tight, and if you fire it with a super tight chamber, you MIGHT have the ejector ripping the rim of the shell off. You could also have a chamber thats not centered on the barrel. (I've seen this ONCE on a rifle. The barrel and chamber were slightly offset.)

I would get this checked ASAP.

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post #21 of 33 (permalink) Old 03-01-2010, 12:00 PM Thread Starter
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If it's "HARD AS FUCK" by hand cycling the gun, it sounds like the chamber of the barrel isn't cut correctly. It's too tight, and if you fire it with a super tight chamber, you MIGHT have the ejector ripping the rim of the shell off. You could also have a chamber thats not centered on the barrel. (I've seen this ONCE on a rifle. The barrel and chamber were slightly offset.)

I would get this checked ASAP.
The first inch or so is really hard, but after that it is normal.

There isn't too much damage on the shell casings (I saved them), just a light scratches on the side from the feed ramps.

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post #22 of 33 (permalink) Old 03-01-2010, 12:12 PM
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post #23 of 33 (permalink) Old 03-01-2010, 12:45 PM
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The first inch or so is really hard, but after that it is normal.

There isn't too much damage on the shell casings (I saved them), just a light scratches on the side from the feed ramps.
You're not answering the questions... is it sticking and then breaks free, or is it a slow grind at the beginning? Sounds like it may just need to polish the chamber - on new uppers this is common - like I've said before.
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post #24 of 33 (permalink) Old 03-01-2010, 02:19 PM Thread Starter
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You're not answering the questions... is it sticking and then breaks free, or is it a slow grind at the beginning? Sounds like it may just need to polish the chamber - on new uppers this is common - like I've said before.
slow grind at the beginning. What can I do to polish the chamber?

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post #25 of 33 (permalink) Old 03-01-2010, 07:31 PM
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highly doubt it is the headspace since that is set from screwing the barrel into the barrel extension and I have not seen an AR barrel for sale yet that didn't have the extension already installed......

As above, prolly needs the chamber polished or the buffer is too heavy for the longer gas tube.
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post #26 of 33 (permalink) Old 03-01-2010, 07:43 PM
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highly doubt it is the headspace since that is set from screwing the barrel into the barrel extension and I have not seen an AR barrel for sale yet that didn't have the extension already installed......

As above, prolly needs the chamber polished or the buffer is too heavy for the longer gas tube.
I've seen a AR have a headspace issue. Not everyone is perfect when they install everything.

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post #27 of 33 (permalink) Old 03-01-2010, 07:54 PM
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slow grind at the beginning. What can I do to polish the chamber?
Does it act the same without a case in the chamber?

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post #28 of 33 (permalink) Old 03-01-2010, 09:24 PM Thread Starter
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Does it act the same without a case in the chamber?
Nope works just fine.

riceeaters pic puts mine under the bad category.

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post #29 of 33 (permalink) Old 03-01-2010, 09:36 PM
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Nope works just fine.

riceeaters pic puts mine under the bad category.
If the person who installed your Rifle Extension and barrel installed the WRONG rifle extension, you probably have more issues than you think.

I'll bet your headspace is wrong, and something else probably isn't aligned right. Take the gun to a gunsmith and have it fixed. They can set everything up correctly.

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post #30 of 33 (permalink) Old 03-01-2010, 10:35 PM Thread Starter
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If the person who installed your Rifle Extension and barrel installed the WRONG rifle extension, you probably have more issues than you think.

I'll bet your headspace is wrong, and something else probably isn't aligned right. Take the gun to a gunsmith and have it fixed. They can set everything up correctly.
Where is a good place around Arlington?

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post #31 of 33 (permalink) Old 03-01-2010, 11:51 PM
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post #32 of 33 (permalink) Old 03-02-2010, 05:23 PM
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Pop it out with a cleaning rod.

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post #33 of 33 (permalink) Old 08-27-2010, 01:41 PM Thread Starter
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I know this is an old thread, but I finally got my gun fixed. After taking it to the company I bought it from twice I gave up on. Strategic Tact. Response.

I ended up at the gunsmith at the Winchester gun range, and he found out the port that the gas tube fits into the receiver was not machined correctly. The hole just needed to be drilled out and everything is good to go.

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