Black Rifles AR eject issues

[kg4kpg]

Last night Dave and I assembled my new upper and today after doing some chores I took it to Boggy Head to try out. I set up a target at 15-20+- yards and 100 yards. On the short target all center of the target. At 100 I was shooting high to the right. Target wasn't set up real well so I didn't make any adjustments on the BUIS but will next time out. I did have an eject issue though. First mag was a 20 round with standard 55gr .223. All 20 shot perfect, fed and ejected fine. Second, 30 rd mag the first 5 or so went fine then they wouldn't eject any longer. My father-in-law shot some so I could observe the ejection and it didn't look like the bolt cycled back at all. Shot kind of like a single shot gun. I even lubed the action up a good bit, just in case. I could eject the empty and chamber the next round and fire it. I looked everything over when we got home but couldn't see anything out of the ordinary, no loose bolts, parts rubbing, etc. Set-up is an Aero-Precision upper with a DPMS M4 barrel and DPMS bolt group. Oh yeah, when I fired the A2 upper last week we had some fail to ejects as well, could it be ammo? Don't remember the brand off the top of my head but rounds are from the same batch.

Any ideas?

Thanks,

Chris

 

[Dave29461]

I think we have a gas leak. Sent you a PM.

 

[fordnut]

It soounds like a problem with the ammo....If you tried 2 uppers and it reacted the same...It just about has to be the ammo.

Just one upper doing it and I would say you have a problem with the bolt system, but, if you have the same problem with 2 different uppers...try other ammo...

Steve

 

[Clicker]

Pull the BCG out of the gun and check the ejector. Depress the ejector plunger until flush with the boltface then release.
Did it return to the fully extended position?
Did it do so quickly?
I ask because I had a bolt that got some brass shavings stuck beside the ejector and jammed it up, the gun would not eject since the ejector was in a retracted position.

Another check would be of the gas rings. Stand the BCG, in the extended position, on it's face on a hard flat surface if the carrier moves the rings are toast.

Lastly make sure the chamber is clean.

 

[jjwestbrook]

did you use the same BCG with both uppers??

 

[kg4kpg]

I did use the same BCG. I pull it tomorrow night and give it a good look-over again with the check you guys described. I'll be at the M-16 range at Ft Jackson this coming weekend so wont get the time to really mess with it until next week. And I've already tried to get my 1Sgt to let me bring mine...he said no. :roll:

 

[jjwestbrook]

if both uppers have Fatlures to extract with the same BCG then i would look at the BCG. make sure that the gas key screws are tight and properly staked.

 

[armedpig]

Could be ammo if the same batch is acting the same with two different uppers. That is if both of those uppers each had their own bolt carrier.

If the same bolt and carrier were used with both uppers, I would think it would be the bolt and/or carrier. Make Look to seee if the bolt is installed the right way in the carrier. Check the ejector to see if it springs back properly. Also look at the ejector and see how it is marked. The ejector should be split in the way it is marked, the brass should only be contacting the inner half, the outer half should be unmarked by brass.

 

[kg4kpg]

Well, problem solved and I feel like an ass. I was sure I had the gas key dcrews tight last time but when I was prepping to go to Boggy Head today I looked over thr BCG I could move the gas key. I dug out an allen wrench and both tightened. I torqued it down, went to the range and put 90 round through with no issue at all. Checked when I got home and still tight so I think this issue is closed. Now I can concentrate on saving for optics.

 

[Red Hat]

You need to stake the gas key to the machine screws. If you don't they will loosen up again. Just use a hammer and center punch. Use the punch to indent the metal of the gas key so that it is touching the screw head. Do this on opposite sides of the screw head, two stake points per screw. Do a Google Image search staking ar gas key and you'll see how it's staked. You'll never have this problem again.

 

[Halfcocked]

I have a gas key staker, so if you bring you BCG by the shop I can probably hook you up with that.

 

[kg4kpg]

I have a gas key staker, so if you bring you BCG by the shop I can probably hook you up with that.

Thanks, I'll see if I can get by there this week sometime. I don't get back to Summerville until around 5pm, you guys still open then?

Thanks,

Chris

 

[Glockrunner]

And the optics will be????

 

[kg4kpg]

And the optics will be????

Well, gonna be either the Nikon M-223 2-8x32 with BDC 600 Reticle or Nikon M-223 3-12x42SF BDC 600 Reticle, either with the M-223 mount. Just depends on my budget. I had an ACOG 4x32, TA31 I think, in Iraq in '05 and would love to have a personal one but way over my price limit. Such a nice peice of equipment.