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 Post subject: Re: AR gurus, help needed.
New postPosted: November 10th, 2014, 8:21 pm 
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AZS; Woohoo!
AZS; Woohoo!

Joined: February 5th, 2012, 11:04 am
Posts: 2169
Location: Goodyear
223 has less pressure. If it doesn't run on 556 it probably won't run on 223...if it's a gas problem like we think

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 Post subject: Re: AR gurus, help needed.
New postPosted: November 10th, 2014, 8:24 pm 
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Joined: March 28th, 2005, 10:29 pm
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Location: Az, Land of the free - for now.
I'm guessing it's a 223 chamber .
556 will run in 223, up to a point.

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 Post subject: Re: AR gurus, help needed.
New postPosted: November 14th, 2014, 8:54 am 
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AZS; Woohoo!
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Joined: October 8th, 2005, 10:48 pm
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Barrel has ZERO markings on it, no caliber, manufacturer or anything. I don't know how to take off the front sight.


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 Post subject: Re: AR gurus, help needed.
New postPosted: November 26th, 2014, 6:23 pm 
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AZS; Woohoo!
AZS; Woohoo!

Joined: October 8th, 2005, 10:48 pm
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Location: GOODYEAR
Got the front sight off. Here's the gas hole

Image

Image

I have no clue what the actual size of the hole is, All I can ask is does it look right?

The gas tube appeared to match up with the hole in the front sight and both were clear.


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 Post subject: Re: AR gurus, help needed.
New postPosted: November 30th, 2014, 8:28 pm 
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AZS; Woohoo!
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Joined: September 3rd, 2005, 1:05 pm
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Location: Central Phoenix
Gage pins are the only sure way of knowing what the diameter is, but a number drill set can get you pretty close. Use a set of them to find the largest size that will enter (use the shank, not the cutting end!) and double check by mic'ing the shank. Get back with us when you have that info.

Alternatively, can you bring the upper/barrel to central Phoenix? I'll gauge the hole for you. Just a thought....

L. Mike

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 Post subject: Re: AR gurus, help needed.
New postPosted: December 1st, 2014, 2:53 pm 
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AZS; Woohoo!
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Joined: October 8th, 2005, 10:48 pm
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Location: GOODYEAR
found the barrel markings. I should know by now to have my glasses on when looking for such things.

It's marked DTI 1/9 556 nato

I've been needing a dial caliper, I'll get the measurement when I procure one.


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 Post subject: Re: AR gurus, help needed.
New postPosted: December 1st, 2014, 7:42 pm 
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Just out of curiosity, have you checked / replaced the gas rings? Are they set properly? What does the inside of the carrier look like? Is it full of carbon buildup or clean? Is the FSB properly indexed over the gas port? Is there any signs of leakage where the gas tube enters the FSB?

There is something about that picture of yours that suggests the FSB is not properly aligned over the gas port.


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 Post subject: Re: AR gurus, help needed.
New postPosted: March 22nd, 2015, 12:40 pm 
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Joined: March 12th, 2015, 2:29 pm
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Make sure the gas key is properly secured. I had this same issue on one of my full auto guns.


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 Post subject: Re: AR gurus, help needed.
New postPosted: May 7th, 2015, 1:37 pm 
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AZS; Woohoo!
AZS; Woohoo!

Joined: October 8th, 2005, 10:48 pm
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Location: GOODYEAR
well, tore it apart and the gas port seems to be fine, It looks kinda big to me but what do I know. The BCG is practically new an the gas key is tight and staked. Because the BCG group is newer I'm thinking there may be a bit of drag on the gas rings till they get more wore in but that shouldn't keep it from cycling. The gas tube is clear and appears to be fine. The hole in the barrel matches up to the hole in the front sight assembly. Put the upper on an A2 style lower and it seemed to work better but not much. It had a hard time working through the first five or so rounds in a thirty round magazine then it would run fine. I was running it dry also to see how it did in that condition. I'm not overly enthusiastic about a finicky rifle that has to kept soppin wet to run right. Polished up the bottom of the bolt carrier and the hammer so they should slide better. I'm gonna have to lube it and see how it works. I've never had an AR that refused to run (and ive had about a dozen or so) dry so maybe this is just a first. By the way, It did this with both XM193 and commercial Remington .223.

Would cutting a few coils off the buffer spring help? It was cycling far enough back to eject the empty but wasn't striping the next round out of the magazine.

This one is gonna be a problem child. :(


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 Post subject: Re: AR gurus, help needed.
New postPosted: May 7th, 2015, 1:48 pm 
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AZS; Woohoo!
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Joined: February 5th, 2012, 11:04 am
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Location: Goodyear
Is the correct buffer and spring in there? If the buffer is say an A5 vltor and the tube is a standard 6 position there would be a problem. If you hand cycle will it grab the next round or does it not come back far enough still?

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 Post subject: Re: AR gurus, help needed.
New postPosted: May 7th, 2015, 1:52 pm 
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AZS; Woohoo!
AZS; Woohoo!

Joined: October 8th, 2005, 10:48 pm
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It hand cycles just fine and once it gets past the first few rounds in a full thirty rounder it works ok too. The fact that it mis-behaves on two separate lowers leads me to believe its still something in the upper.


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 Post subject: Re: AR gurus, help needed.
New postPosted: May 7th, 2015, 2:32 pm 
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AZS; Woohoo!
AZS; Woohoo!

Joined: February 5th, 2012, 11:04 am
Posts: 2169
Location: Goodyear
It has to be a gas problem. Do u have another bcg? If not I'm close and you can borrow one to try and see if that fixes it

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 Post subject: Re: AR gurus, help needed.
New postPosted: May 7th, 2015, 3:49 pm 
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Joined: January 1st, 2006, 8:21 am
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I believe it is a gas problem. I had the same issue and found gas leak around the sight base. I have a very good bore scope that you can see if the sight base is indexed correctly. You could bring it by to check it out. I live near you.


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 Post subject: Re: AR gurus, help needed.
New postPosted: May 30th, 2015, 8:04 pm 
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Joined: December 17th, 2005, 11:16 pm
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Location: far NE Phx
Did it get fixed? What was the problem?


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 Post subject: Re: AR gurus, help needed.
New postPosted: June 7th, 2015, 4:09 pm 
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AZS; Woohoo!
AZS; Woohoo!

Joined: October 8th, 2005, 10:48 pm
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Location: GOODYEAR
Dunno yet, haven't taken it back out. I'll report when I do.


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