new AR, and problems

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Strangely chewed up...maybe it was in the action? Anyway, I would clean that bolt up well and make sure the extractor and ejector move and try it again...it looks kinda cruddy.
 
That mangled up washer did not come from your AR. You've been given some good trouble-shooting advice here.

First, let me state my understanding of the problem so we can be sure I know what we're all looking at. This is a rifle that functioned just fine for the first magazine, and now without explanation will function as a single-shot only. Upon pulling the trigger, the gun discharges but the bolt does not cycle. Upon racking the charging handle an empty is extracted and ejected, a new round is fed to the chamber, and the rifle can be fired again. All is correct?

If so, follow the advise you have been given about running some WD-40 through the gas system. Stick the hose into the receiver end of the gas tube, and blow WD out through the barrel. Then, blow WD in through the end of the gas key to ensure it runs out through the middle of the bolt carrier. Somewhere, something is blocking the gas system. My guesses are foreign debris in the gas key (I know you already checked visually, but maybe something made it past the corner), or your gas block has shifted and closed off the gas port. Looks to me like your gas block would be fastened with set screws instead of taper pins. Check to see if any of the screws are loose, or if the gas block has shifted toward the muzzle end of the barrel. There is a shoulder on the barrel that the gas block should be pushed down against. Is there a gap between the gas block and this shoulder?
 
TALIV, and others,


I did squirt some breakfree from the receiver end down through to the barrel end...most of it seems to run out of the Delta Ring and handguards...keep in mind the handguards/gas block are on so I didn't try the reverse yet...had a devil of a time getting the handguards back on, so NOT looking forward to doing it again at least until tomorrow/later today...
 
AcceptableUN: Midway website has a good lesson on assembly of AR top and bottom. watch those lessons while looking at your gun and you'll find the problem. I'd almost promise that it's a minor, no brains problem but hard to long distance diagnose. So check out midway and you'll be an expert in no time. BTW I alway's run a new AR very wet for first 100 rounds and in seems to help. AR's are alot easier to work on then most shopguns. Have fun.
I just looked at the bolt faces. Is that really filthy bolt your's? It looks like the firing pin is jammed with a piece of s-shaped metal and doesn't look like extractor has moved in along time. Ejector is so crudded up I can't tell if it has ever moved. get some spray cleaner and brush and clean bolt face then see if extractor has spring tension and move, push in ejector and seeif it springs back, push firing pin back and forth to see it it's free. If that's your bolt your friend NEVER cleaned it and nothing stands up to that kind of abuse.
 
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I did squirt some breakfree from the receiver end down through to the barrel end...most of it seems to run out of the Delta Ring and handguards...
Click to expand...

I assume you are talking about the receiver end of the gas tube? If so, is the Breakfree going into the gas tube at first and then backing up and flowing out onto the delta ring and handguards or are you saying that no Breakfree is backing up but it ends up on the delta ring and handguards?

Have you examined the gas tube for any visible breaks or holes?
Have you tried squirting Breakfree into your gas key (the tube on the top of your bolt carrier) to see if it slows freely down onto the bolt? If not, you need to try this.
Any sign of movement in your gas block (the part underneath your front sight on the barrel)? That style of gas block strikes me as a likely culprit.
 
let me think of an example for you.

the extractor on the slide of my p220 is very springy. I can press down on it and feel tension.


this extractor isnt. it doesnt budge...i fieldstripped the bolt, and there doesnt seem to be any movement on the part of the extractor..as for a block in it, wd goes into the gas key and leaks out of the two holes underneath....
 
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shouldnt there be a spring in there additional to what you see? the little round pad has some spring to it, but there was no dedicated spring,....


extractorspringless.gif
 
that "pad" looks like an o-ring, spring, and insert to me (though i can't tell for sure if there's an insert in it)


answer bart's question, please
 
when i spray anything into the receiver end of the gas tube, it leaks down and falls on the forward handguard brackets, leaks over and rolls down the gasblock. for whatever its worth, id say very little comes through the gas block on its own accord.


VERY little, if any movement in the gas block.


as for the extractor. i removed, cleaned and replaced. still no spring, bounce or movement when its inserted. also no visible damage to gas tube
 
i called doublestar and found out its an assembled gun, which limits the warranty pretty good. they were nice though. i dont think its a big deal though, but id really like to avoid a trip to the gunsmith!


next plan would be to remove the gas block, correct?


talk about a crash course. thanks for the help so far everyone.
 
Anything you spray into the reciever end of the gas tube (with the barrel pointed down) should come out of the front end of the barrel.

Nothing should be coming out under the handguards and running down the outside of the barrel.

Cracked / Loose gas tube, maybe?

-Tim S.
 
The lump on the end of your extractor farthest from the chamber is (from outside to inside) an O-ring, the extractor spring, and it does appear that extractor spring insert is in there too. That would be these: http://www.bravocompanyusa.com/BCM-Extractor-Spring-Uprade-Kit-p/bcm extractor spring upgrade.htm Looks like everything is in order there.

Sounds like an obstruction in the bolt carrier has been ruled out. It also sounds like the WD you are blowing into the gas tube isn't coming out through the barrel like it should. My next step would be to remove the gas tube roll pin, and take the gas tube out. Check the gas tube for obstruction by blowing a little WD through it. If there is an obstruction in the gas tube (which would be very unlikely, but is easy to rule out), it's a cheap part to replace. Next, use two fingers to pinch the roll pin holes on the gas block shut, hold the chamber end up, muzzle end down and put some WD or very light lube into the hole where the gas tube inserts into the gas block. It should (slowly) leak through the gas port into the barrel. If you aren't getting flow through here, your gas block is not aligned with the gas port.
 
took it out again today. same thing.


heres my dilemma...i dont really trust the 2 or 3 gunsmiths in my area, for different reasons. theyre either dishonest, priced way too high, or really arent qualified to be a gunsmith.


where should we go from here? i pretty much found out its an assembled rifle and doesnt have a warranty....
 
any videos youd recommend for taking the gas block down? thats where I want to go from here, probably so I can blow stuff from one end to the other...


heres the gunsmith situation - one guy that doesnt answer the phone, and works primarily on bolt actions and revolvers


another that charges 30 an hr, will probably gouge and tell me stuffs wrong that isnt


another that charges 60 an hr, and will gouge worse than anyone


i REALLY am hoping to do this myself. a gunsmith is THE last resort for me...
 
hoping someone can maybe walk me through the disassembly and reassembly of this gas block/muzzle brake. ive never done this. here are pics of what im working with. thanks to all so far and in advance.

gasblockbarrel001.gif
gasblockbarrel002.gif
 
No need to fuss with the muzzle.

Get a small punch and gently knock out the roll pin that holds the gas tube in the gas block. Loosen the two setscrews that hold the gas block in place. Tap the gasblock forward, clear of the gastube. Remove the gastube and check for defects and obstructions. Check the hole in the barrel for obstructions.

Reassemble everything and test fire.
 
To check for a blocked gas tube or carrier key use a piece of thin wire. It should pass through the carrier key and poke out into the inside of the carrier.

Also, run a piece down the gas tube (from the inside of the receiver) to see if it reaches the gas block.

One more thing. If you are leaking gas out from the gas block itself, there should be evidence of carbon showing on the barrel around it. The gas has GOT to be going somewhere.

It sounds to me like the port on the barrel and gas block are misaligned due to the block moving on the barrel slightly.
 
got gas tube loose....but cameras out of batteries. im going to check pics for you guys to evaluate. check back in awhile. thanks for the help so far!


also, would it hurt to blow the gas tube out with a high powered air compressor? dont have any canned air/duster on hand...
 
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