Help me avoid losing my mind!!

Reaper665

Reaper665

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Location
White Water Region, Ontario
Hi all,

Can anyone give me an idea why my build will not cycle more then one round at a time?

Parts breakdown:
NEA lower, upper, 10.5" barrel, bcg, 12" quad rail, carbine length gas tube and lpk
Rainier arms mil spec tube
Noveske "pig"
BCM gas block
Magpul CTR

I have torn this thing apart 5 times at the range and I'm stuck. I'm at 200+ rounds fired. I've polished the hammer as the bcg seemed to hang up on it.



HELP please.
Thanks
 
It ejects a spent case and pushes back the hammer but won't pick up a new one. Some times I get a jam where the round is half in the mag and half on the feed ramps. Now in saying that, the first three mags I fired today were flawless. After that it all went to s&@t again. Do I have a gas issue (I know they make medicine for that lol)?
 
Camo tung said:
Gas system all good, no blockages? What you describe sounds like a single shot.
Any drag marks on your BCG, BCG moves ok in the upper by hand?
Click to expand...

Yes, I use snap caps and everything is fine. Maybe when it cycles it doesn't come back as far as when you charge by hand. Also, I don't get an open bolt after the last shot. I have blown through the barrel with the gas system intact and all is well. There are some drag marks on the bottom of the carrier, but I don't know if that was there from before I polished down the hammer. Everything feels smith now.
 
What Ammo
What Buffer
What Spring
Is gas port in perfect alignment with the hole in barrel
is gas tube in perfect alignment ( Holes)

If you take trigger group out it is easier to check for dragging (no buffer spring)

its one of the above
 
Sounds similar to a problem I had with my dissipator upper. To short a gas impulse as a result of not enough barrel length beyond the gas port to produce a long enough gas impulse.
 
just having some fun said:
What Ammo
What Buffer
What Spring
Is gas port in perfect alignment with the hole in barrel
is gas tube in perfect alignment ( Holes)

If you take trigger group out it is easier to check for dragging (no buffer spring)

its one of the above
Click to expand...

I have switched ammo back and forth between mfs and Norc stuff. I am going to try hand loads or quality ammo.
The buffer is a DPMS carbine buffer. The spring is carbine length brand unknown. I have been meticulous ensuring the gas system is functioning. I should just bought another norinco. At least I know they work.
 
As was stated before, if it's an NEA barrel, check the diameter of the gas port in the barrel. An undersized gas port will cause short stroking, which is the problem you're describing.
 
And here I thought I was going to just slap this thing together and go shooting. Maybe a lighter buffer return spring or maybe the gas hole in the barrel has to be revisited. Errrrrr!!

Thanks very much to my fellow gun nuts for some insight on this issue.

Happy shooting
Reaper
 
Reaper665 said:
And here I thought I was going to just slap this thing together and go shooting. Maybe a lighter buffer return spring or maybe the gas hole in the barrel has to be revisited. Errrrrr!!

Thanks very much to my fellow gun nuts for some insight on this issue.

Happy shooting
Reaper
Click to expand...

I highly doubt this is a buffer/spring problem.
 
Stop feeding it garbage and stay away from handloads until you know the rifle works on quality factory ammo. Go buy some decent ammo and try again after you check to see if your gas key is tight and if the gas block is aligned correctly with the gas port. Try slipping a piece of tubing over the gas tube where it comes into the receiver and blow into it, if it's hard to blow through you either have a blockage or it's not aligned correctly.
If you are using a standard carbine buffer and spring you should be fine. A lighter or heavier spring or buffer would be more for fine tuning the system not making it work. An AR is fairly overgassed to start with so it should cycle unless there is something physically wrong with it like a loose gas key, too small of gas port, misaligned gas block, missing gas rings, etc...
When you cycle it by hand does the bolt and carrier go all the way back? Did you use a rifle spring or buffer in a carbine tube?
Did you assemble it from new or used parts?
Is it wearing away any coatings on the BCG or receiver internals?
Oil? AR's like oil.
More details and we can probably find a solution.

Good luck
 
Sound like the problem I had with my second NEA barrel(the gas port wasn't drill on the first one :rolleyes:). The gas port was misaligned but not on the rotation axe(left/right) but depth of the barrel( don't know if that make sense ). I had to move my gas block forward, leaving a small gap of around 1/8" between the thickness part of the barrel and the gas block.
 
Reaper665 said:
I should just bought another norinco. At least I know they work.
Click to expand...

Next time you go the the range try your NEA lower on your Norc upper. If it works fine you can likely rule out the lower.

Also, try taking off the flash pig and testing it as well. The flash pig should increase dwell time, which you would think would help your problem, but if the the rifle is already over gassed it could be compounding the problem.

Over gassed gun increases bolt speed wich may result in the bolt not picking up a round and not locking on an empty mag......
 
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