NEA BCG Failure to eject.... anyone else have this problem or have a solution

Throttle_monkey1 said:
Just a question, is it assembled correctly? If the bolt is installed in the carrier 180 degrees out the ejector will eject inwards. It's a long shot but could be the problem
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The BCG is cut so that this is not possible.

I once had a bolt assemble with the wrong ejector spring. They used a detent spring instead of the safety/ejector spring.

GC
 
Gas Can said:
The BCG is cut so that this is not possible.

I once had a bolt assemble with the wrong ejector spring. They used a detent spring instead of the safety/ejector spring.

GC
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The BCG opening for the bolt is circular and the bolt can rotate a full 360 degrees. At least this is the case with two of my DD BCGs. The bolt, however, should be peened on one end of the cam pin hole so that the cam pin will only fit through one side, thereby properly orienting the extractor. Keep in mind, this is an NEA bolt we're talking about. Ouch, I know.

Again, we're just speculating since the OP has not replied with his findings.
 
Trinimon said:
The BCG opening for the bolt is circular and the bolt can rotate a full 360 degrees. At least this is the case with two of my DD BCGs. The bolt, however, should be peened on one end of the cam pin hole so that the cam pin will only fit through one side, thereby properly orienting the extractor. Keep in mind, this is an NEA bolt we're talking about. Ouch, I know.

Again, we're just speculating since the OP has not replied with his findings.
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Yes. Not sure what I was thinking. Should have been more clear. The bolt is drilled/peened...or made so that the pin can only go in from one side....at least on modern bolts.
 
Wow.... so many responses to catch up...

Yes, everything is as it should be... the ejector springs up and down like it should... I did the Pepsi challenge against another BCG and everything APPEARS to be the same...

I think I'm going to do as suggested above... Switch it out to a DD or like!

Thank you all for your responses and input!
 
Throttle_monkey1 said:
The bolt isn't supposed to move freely. If it does your gas rings are worn. A simple test is to stand the BCG up on a table. There should be enough resistance to hold the weight of the bolt carrier.
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Just trying to wrap my head around what you are saying here. So if I take my BCG, pull the bolt all the way forward (as you would when installing the BCG into the upper), you should then be able to stand the entire BCG, bolt down, and the bolt shoult not slide back into the carrier?
 
Throttle_monkey1 said:
The bolt isn't supposed to move freely. If it does your gas rings are worn. A simple test is to stand the BCG up on a table. There should be enough resistance to hold the weight of the bolt carrier.
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Yep. I noticed this recently when I discovered I had shot one AR enough to wear out the gas rings. New, there should be a fair bit of resistance to the bolt moving in the carrier. Only once the gas rings are worn does the bolt move easily in the carrier.
 
Great Crouton said:
Just trying to wrap my head around what you are saying here. So if I take my BCG, pull the bolt all the way forward (as you would when installing the BCG into the upper), you should then be able to stand the entire BCG, bolt down, and the bolt shoult not slide back into the carrier?
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Yup. My bad for not clarifying. I just got a norc cqA used from the EE (great beater ARs btw) and the bolt would slide into the carrier like butter. Changed the gas rings and it passed the stand up test. It probably would have cycled with the old rings still in it but I had some rings laying around and they're like 3$ a set.
 
Throttle_monkey1 said:
Yup. My bad for not clarifying. I just got a norc cqA used from the EE (great beater ARs btw) and the bolt would slide into the carrier like butter. Changed the gas rings and it passed the stand up test. It probably would have cycled with the old rings still in it but I had some rings laying around and they're like 3$ a set.
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Interesting....I'll have to try that out. Thanks for the info.

Now what are the ramifacations of worn rings? What does it effect? Still an AR Noob :)
 
Great Crouton said:
Interesting....I'll have to try that out. Thanks for the info.

Now what are the ramifacations of worn rings? What does it effect? Still an AR Noob :)
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Short stroking due to gas leakage around the gas rings. Not to say that your AR will start having issues as soon as the gas-ring test fails. It might run a few hundred more rnds before it does start giving problems. Not worth the hassle for a $4. part. I usually keep at least one spare set of rings in my range tool box... I still haven't worn down my rings yet.
 
Trinimon said:
Short stroking due to gas leakage around the gas rings. Not to say that your AR will start having issues as soon as the gas-ring test fails. It might run a few hundred more rnds before it does start giving problems. Not worth the hassle for a $4. part. I usually keep at least one spare set of rings in my range tool box... I still haven't worn down my rings yet.
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Hmmm, I'm not convinced mine would past this test. And I am experiencing short stroking I believe but had blamed that on my reloads, only happened with the weaker charges, almost elminated on higher charges but the bolt normally failed to lock open on the last shot regardless.

I know what I'm doing the second I get home.
 
Great Crouton said:
Hmmm, I'm not convinced mine would past this test. And I am experiencing short stroking I believe but had blamed that on my reloads, only happened with the weaker charges, almost elminated on higher charges but the bolt normally failed to lock open on the last shot regardless.

I know what I'm doing the second I get home.
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That could be your short stroking problem. What barrel length are you running? I have a 10.5" LMT that would short stroke with anything other than full power 5.56 NATO ammo. I replaced my gas rings on that one too just to rule it out. Still didn't help. I ended up drilling my gas port to 0.083". It was originally 0.071". Now it runs with all kinds of ammo and I threw a heavier buffer in it.

In your case I'd definitely start with checking your rings to see if they're worn. Think of them as piston rings. Worn=no seal.
 
Throttle_monkey1 said:
That could be your short stroking problem. What barrel length are you running? I have a 10.5" LMT that would short stroke with anything other than full power 5.56 NATO ammo. I replaced my gas rings on that one too just to rule it out. Still didn't help. I ended up drilling my gas port to 0.083". It was originally 0.071". Now it runs with all kinds of ammo and I threw a heavier buffer in it.

In your case I'd definitely start with checking your rings to see if they're worn. Think of them as piston rings. Worn=no seal.
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Barrel is 14.5 inches. Much to my surprise, the bolt did pass this test. I wonder if I should take a boo at my gas port but really not sure how to measure it. Either it's a hair small or my rifle like it's rounds hot. I shot a couple of boxes of AE Blackbox and it made my rifle shoot like a laser, couldn't believe the accuracy for cheap ammunition. Bolt locked open on last shot too.

I twisted up some new rounds yesterday that are pretty damn close to max. I'll see how those do.
 
Great Crouton said:
Barrel is 14.5 inches. Much to my surprise, the bolt did pass this test. I wonder if I should take a boo at my gas port but really not sure how to measure it. Either it's a hair small or my rifle like it's rounds hot. I shot a couple of boxes of AE Blackbox and it made my rifle shoot like a laser, couldn't believe the accuracy for cheap ammunition. Bolt locked open on last shot too.

I twisted up some new rounds yesterday that are pretty damn close to max. I'll see how those do.
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There is almost zero probability that your port is too small given the mount of overgassed #### being sold in Canada. I won't run anything else than correct (mil-spec) gas ports, in other words, LMT.
 
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