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-   -   AR Reliability (http://www.firearmstalk.com/forums/f20/ar-reliability-2090/)

1984cj 10-02-2007 03:51 PM

AR Reliability
 
I have my first AR(got it used in a trade) and just returned from the range.
My first impression is one of disappointment. My AR will not feed itself.
I get one round and a click. Then I have to manually work the charging handle.
I get one round and a click. And here we go again.
It was clean and it had a light coating of oil on the bolt carrier and mechanism. There is no dirt in the chamber/ bolt area.
I am shooting factory Remington 55grn FMJ.
I tried a 20rnd Brownell's Mag(Brand new)
I tried a 30rnd Stoner Mag that I received with the rifle.
No change.
Any suggestions to making this thing fire semi- auto rather than single shot?

Also, how do I lighten the trigger pull?

Bidah 10-02-2007 04:45 PM

Ok, CJ, just a little bit more information.

Does the fired round eject?
Is it just not stripping the next round?

Some things to check for the above issues. Loose gas rings, loose carrier key.

Give us some more and let us see if we can't figure it out.

-Bidah

1984cj 10-02-2007 09:14 PM

Any info I can provide I will.
Insert Loaded mag
operate charging handle
Sight down range squeeze trigger BANG
Empty ejects like I expect it to and lands ~4 feet to the right just about inline with the ejection port.
Fails to strip next round.
Operate charging handle. Repeat same exact process.

Almost like the bolt carrier is not moving far enough back to catch the next round.
I will field strip it this evening and clean it again. what are the grease points on the bolt carrier/bolt and how oiled should it be?
Gun seemed to operate normaly it just wasn't loading the next round from the magazine. Accuracy was good. Bang was good. ejection seemed to be good.
Spent brass looked OK.

matt g 10-02-2007 10:48 PM

Sounds like your gas rings may be bad.

Bidah 10-03-2007 03:47 AM

I would expect ejection to go 6 foot to the front, not to the side. As the ejection spring gets weaker, it will throw it more to the side. For my initial guess, I would bet either gas rings, or very likely a loose carrier key. Make sure that is tight, as in zero movement. Those are the two most common things.

Other things that could be wrong are the gas tube itself being out of alignment.

Do you know what brand it is? More specifically the upper?

I know it helps me to swap parts around with my other ones. I finally tracked down a loose carrier key, that I would swear wasn't loose, but it sure was. Tightened it back down and staked it again, no problem. It also did exactly what you are describing, except every 3rd or 4th round, at the beginning.

-Bidah

Catfish 10-03-2007 01:34 PM

It could also have to much grease in it. When I got mine it had been over greased and I had the same problem. Mine ejects to the side and back also, but brass land alot more than 4 ft. from the gun.

Bidah 10-03-2007 01:44 PM

Sorry CJ, I forgot about the grease/lube question.

The only thing that should be greased is the buffer and spring. The rest can be oiled. For the carrier, there are 2 points on each side of the key, and there are 2 points around the side. You will see where it is wearing. Then lube up the bolt, especially the rings. Keep the bolt lubed up to keep it running.

When new, I run them pretty wet. Once it is broken in, less so on the carrier, but make sure to keep that bolt lubed.

-Bidah

Dgunsmith 10-03-2007 01:58 PM

What stock is on the AR ?

Which buffer & spring are in the stock ?

Its getting gas to extract and eject, just not enough reward carrier travel to strip off the next round.

Often people put on a CAR stock and use the `rifle length buffer spring...and your situation results.

If a parts gun, the gas hole under the gas block (front sight) may be too small
to provide enough gas.

I would also check the gas rings on the bolt and the gas key screws on the carrier.

1984cj 10-05-2007 02:37 AM

OK guys thanks for the check list.
I field stripped it tonight and found nothing obviously wrong.
Bolt and carrier look like they have not had much use. The bolt slides snugly into the carrier and doesn't flop around after it is installed. The carrier key is tight and the staking on the screws is deep and has not moved.
The stock is a collapsible one. I greased the buffer and spring. It looks like it has a carbine buffer(short) and a rifle spring. This should be ok as it is a 24" barrel.
After dissassembly, I think that the rifle may have been insufficiently lubricated. I have fixed that problem :) I am going to take it to the range next tuesday and try it again. Wish me luck!

rickrem700 10-05-2007 05:41 AM

Ar 15
 
Quote:

Originally Posted by 1984cj (Post 9113)
I have my first AR(got it used in a trade) and just returned from the range.
My first impression is one of disappointment. My AR will not feed itself.
I get one round and a click. Then I have to manually work the charging handle.
I get one round and a click. And here we go again.
It was clean and it had a light coating of oil on the bolt carrier and mechanism. There is no dirt in the chamber/ bolt area.
I am shooting factory Remington 55grn FMJ.
I tried a 20rnd Brownell's Mag(Brand new)
I tried a 30rnd Stoner Mag that I received with the rifle.
No change.
Any suggestions to making this thing fire semi- auto rather than single shot?

Also, how do I lighten the trigger pull?

1984cj; I know I am about to tick off a bunch of people hear, but I am just going to tell it like it is, Take that thing back and get your money back, I have been through a few of these, even differant brands and have never had any good luck with them, I'd get one thing fixed then another would happen, it was never ending, They are a money pit everything you save on the cheap ammo you stick back in the gun to keep it going, then there all the aftermarket parts that gets addictive before you know it your rifle looks like somthing from outerspace and weighs 22 pounds, been there done that, Paid dearly for it, If you talk to anybody that has been in battle with one, they all answer the same they are jamomatics, save your self alot of grief and get a fn/fal or an AK , Hell I'd take an SKS over one of those things.


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