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Ar-15 problems ......

Danny36

Private
Full Member
Minuteman
May 21, 2012
23
0
39
Ohio
This weekend I took my AR out for the first time. After firing about 15 rounds it started to jam up and wouldn't eject. I noticed a little carbon on the gas block and took off the handguards. The gas tube wiggled in the block. The upper was already assembled when I bought it and I'm wondering if this sounds like it could be the problem?
 
Re: Ar-15 problems ......

This is probably the problem. But more information is needed:
1. Who made the upper
2. Can you contact that person to fix it?
3. Check that the gas tube is secured with a roll pin in the gas block.
 
Re: Ar-15 problems ......

The upper was assembled by surplus arms and ammo. It's a Daniel Defense barrel with aero precision receiver and a Rock River bcg. I have contacted them about it but I wasn't expecting to hear from them until tomorrow some time. I was hoping it'd be something easy I could fix myself but it's not looking like I can avoid sending the upper back.
 
Re: Ar-15 problems ......

Also there is a roll pin in the gas block and the gas key is staked good and not loose.
 
Re: Ar-15 problems ......

Make sure that the bolt ejector assembly is not dirty, check that the spring is working, by pushing with your finger, also insure that you put some oil in it, and that your gas rings are staggered.

http://firearms.atactv.com/userfiles/image/AR%20Bolt%20Assembly(1).jpg
 
Re: Ar-15 problems ......

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Danny36</div><div class="ubbcode-body">Also there is a roll pin in the gas block and the gas key is staked good and not loose. </div></div>

This. Is there a roll pin holding the gas block or is it the set screw type? If it is the set screw type do the set screws have thread locker on them?
 
Re: Ar-15 problems ......

the question is; does it wiggle in the front at the gasblock? Also, how much blast residue is running down the front of the tube (right behind the gas block? Can you rotate the gas block by hand?
 
Re: Ar-15 problems ......

It does wiggle at the front of the gas block and the gas block does have a slight amount of play in it. It has two set screws at 6 o'clock and a roll pin securing the tube. If I could figure out how to upload pictures from my phone it'd probably be easier to explain but there was carbon on the outside of the gas tube where it exited the block.
 
Re: Ar-15 problems ......

Just got an email from the company I bought it from. They offered to fix it if I was going to pay to ship it back. Fuck that. Looks like I'll just be learning more about the gas system and not be going to surplusammo.com for any more parts. Thank you guys for the help!
 
Re: Ar-15 problems ......

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Danny36</div><div class="ubbcode-body">It does wiggle at the front of the gas block and the gas block does have a slight amount of play in it. It has two set screws at 6 o'clock and a roll pin securing the tube. If I could figure out how to upload pictures from my phone it'd probably be easier to explain but there was carbon on the outside of the gas tube where it exited the block. </div></div>

Sounds like the set screws might have come loose. I would check them and see if they put some kind of thread locker on them.
 
Re: Ar-15 problems ......

The set screws were loose. I'm going to tighten them down and put loctite on them and run it this weekend. If the problem continues I'm going to get a new gas tube and block.