Fail to Eject

[jshelby3]

I finally got a chance to take my ar out to shoot yesterday.
took 20 rounds of reloads,40 rounds of wolf 120`s and 20 round of Hornaday 123`s.
all failed to eject using BHW 16" HBar style barrel Pri lopro gas block and carbine length gastube.
everything failed to eject I`ll disassemble today and check for alignment problems with gasblock any more thoughts.

[GLSHOOTER]

Nov 22, 2012 1:40:27 GMT -8 jshelby3 said:

I finally got a chance to take my ar out to shoot yesterday.
took 20 rounds of reloads,40 rounds of wolf 120`s and 20 round of Hornaday 123`s.
all failed to eject using BHW 16" HBar style barrel Pri lopro gas block and carbine length gastube.
everything failed to eject I`ll disassemble today and check for alignment problems with gasblock any more thoughts.

Is this a new rilfe or has it been GTG before? Right buffer/spring combo? Make sure there is plenty of lube on the BCGt and most certainly check the gas block.

Greg

[Deleted]

Nov 22, 2012 5:08:53 GMT -8 GLSHOOTER said:

Nov 22, 2012 1:40:27 GMT -8 jshelby3 said:

I finally got a chance to take my ar out to shoot yesterday.
took 20 rounds of reloads,40 rounds of wolf 120`s and 20 round of Hornaday 123`s.
all failed to eject using BHW 16" HBar style barrel Pri lopro gas block and carbine length gastube.
everything failed to eject I`ll disassemble today and check for alignment problems with gasblock any more thoughts.

Is this a new rilfe or has it been GTG before? Right buffer/spring combo? Make sure there is plenty of lube on the BCGt and most certainly check the gas block.

Greg

What Greg said. Also when you say fail to eject, do you mean failed to extract? Or failed to eject. Fail to eject can mean a lot different things. If you will explain exactly what its doing, we can help you get it running.

An AR is just a machine much like your car. A little adjustment can go a long ways.

[jshelby3]

New barrel / upper build, well lubed.
It was a complete fail to cycle.
found a bad gas tube when I disassembled it. Replaced it ready to try running it again.

[GLSHOOTER]

Nov 22, 2012 7:21:13 GMT -8 jshelby3 said:

New barrel / upper build, well lubed.
It was a complete fail to cycle.
found a bad gas tube when I disassembled it. Replaced it ready to try running it again.

I have a feeling you will win this battle.

Greg

[Babaganoush]

I, too, have a fail to eject with my new 20" match grade barrel.
As jshelby3 stated, a complete fail to cycle.

I've observed the bolt traveling only 1/3 the way back and returning to battery. Bolt face never clears the ejection port. Spent case is returned to chamber when bolt returns to battery. This behavior is consistent, with no variations.

Build details:
BHW .264 LBC, 20" Heavy Match, with rifle length gas port at 0.095".
Gas Block is an EGW low profile clamp on.
Gas Tube is a YHM rifle length.
Upper is a DPMS "Mil-spec".
The lower is borrowed from a functioning .223 build (for now) with a stock rifle-length buffer and spring.
The bolt carrier is also from another functioning rifle (I've tried two).
Bolt is a Type II from Tactical Ammunition, with 3 gas rings.
Dragon's Head Muzzle brake/compensator.

Ammunition:
New Hornady Cases, neck sized for concentricity, chamfered and reamed.
123 Gr AMAX bullets
IMR 8208 (I've tried loads between 26.0 and 28.4 grains.)
CCI 450 primers

No muzzle velocity has been measured, but after 60 rounds 100 yard groups are consistent and POA / POI are within reason, as the scope required little adjustment.

I've performed the usual verifications (block alignment, leakage checks, obstruction checks of the tube, block and gas port, etc.) and have found nothing out of the ordinary. Bolt carrier travels smoothly when using the charging handle, with even resistance. No debris was observed when running wet or dry patches through the barrel during cleaning intervals for break-in.

I am at a dead-end. The only thing I can imagine is the possibility of an undersized gas port, but I don't know what the standard size is for this barrel configuration.

Sorry for the lengthy post, but it my hope is that someone will spot the culprit.

Thanks!

David

[Deleted]

Nov 22, 2012 22:58:37 GMT -8 Babaganoush said:

I, too, have a fail to eject with my new 20" match grade barrel.
As jshelby3 stated, a complete fail to cycle.

I've observed the bolt traveling only 1/3 the way back and returning to battery. Bolt face never clears the ejection port. Spent case is returned to chamber when bolt returns to battery. This behavior is consistent, with no variations.

Build details:
BHW .264 LBC, 20" Heavy Match, with rifle length gas port at 0.095".
Gas Block is an EGW low profile clamp on.
Gas Tube is a HM rifle length.
Upper is a DP MS "Mil-spec".
The lower is borrowed from a functioning .223 build (for now) with a stock rifle-length buffer and spring.
The bolt carrier is also from another functioning rifle (I've tried two).
Bolt is a Type II from Tactical Ammunition, with 3 gas rings.
Dragon's Head Muzzle brake/compensator.

Ammunition:
New Horned Cases, neck sized for eccentricity, chambered and reamed.
123 Gr AM AX bullets
MR 8208 (I've tried loads between 26.0 and 28.4 grains.)
CCU 450 primers

No muzzle velocity has been measured, but after 60 rounds 100 yard groups are consistent and PIA / POI are within reason, as the scope required little adjustment.

I've performed the usual verifications (block alignment, leakage checks, obstruction checks of the tube, block and gas port, etc.) and have found nothing out of the ordinary. Bolt carrier travels smoothly when using the charging handle, with even resistance. No debris was observed when running wet or dry patches through the barrel during cleaning intervals for break-in.

I am at a dead-end. The only thing I can imagine is the possibility of an undersized gas port, but I don't know what the standard size is for this barrel configuration.

Sorry for the lengthy post, but it my hope is that someone will spot the culprit.

Thanks!

David

It sounds like your not getting any gas into the gas tube. Or should I say to the carrier. .095 is the correct size for an LBC.

I would recheck your gas system. Something is not right. Check the gas block. Make sure the gas port is in the right place. ( I had a EGW that was made with the port to far to the rear.) Make sure the gas tube is installed right side up. Can you blow through it? Next look for a loose gas key.

If all this checks out do you have access to another gas system from another rifle? If so start changing out parts until the action will cycle. The LBC line of cartridges is way overgased. So with a little parts swapping it should be fairly easy to track down.

[Babaganoush]

Well, I rechecked everything in the gas train, and when attempting to pass a .095 bit through the gas port, noticed some resistance. Applied additional pressure, and something "gave" and the bit continued into the bore space.

Returned to the range and "voila"! The rifle now cycles normally! I can only guess something had gotten into the gas port and partially obstructed it.

Thanks so very much for the help.

Now I have an additional question; "Are all 6.5 magazines considered equal"? I have a couple 10 round AR Stoner 6.5's, and the bolt will fail to strip the 2nd to last round from either magazine. Perfect feeding, otherwise. Are there preferred magazines or ones to specifically avoid?

Thanks again, for the help.

David

[GLSHOOTER]

Nov 23, 2012 15:45:29 GMT -8 Babaganoush said:

Well, I rechecked everything in the gas train, and when attempting to pass a .095 bit through the gas port, noticed some resistance. Applied additional pressure, and something "gave" and the bit continued into the bore space.

Returned to the range and "voila"! The rifle now cycles normally! I can only guess something had gotten into the gas port and partially obstructed it.

Thanks so very much for the help.

Now I have an additional question; "Are all 6.5 magazines considered equal"? I have a couple 10 round AR Stoner 6.5's, and the bolt will fail to strip the 2nd to last round from either magazine. Perfect feeding, otherwise. Are there preferred magazines or ones to specifically avoid?

Thanks again, for the help.

David

You answered your question on the mags. Yours aren't' 100%. Any brand can have issues. That being said pick up some ASC mags from them or J&G Sales in 6.5 and don't look back. They run great and mine are 2.300 long!!

Greg

PS; Garbage taken out.......priceless!!

[Deleted]

Nov 23, 2012 15:45:29 GMT -8 Babaganoush said:

Well, I rechecked everything in the gas train, and when attempting to pass a .095 bit through the gas port, noticed some resistance. Applied additional pressure, and something "gave" and the bit continued into the bore space.

Returned to the range and "voila"! The rifle now cycles normally! I can only guess something had gotten into the gas port and partially obstructed it.

Thanks so very much for the help.

Now I have an additional question; "Are all 6.5 magazines considered equal"? I have a couple 10 round AR Stoner 6.5's, and the bolt will fail to strip the 2nd to last round from either magazine. Perfect feeding, otherwise. Are there preferred magazines or ones to specifically avoid?

Thanks again, for the help.

David

I have not tried the Stoner mags. I have been using the old C Products magazines. You can still get them but they are now ASC Try this link.

www.ammosc.com/storename/ammunitionstoragecomponent2/ViewDept-273393.aspx

[Babaganoush]

;D
Great! Thanks for the help! They will be on order by the time this is read.

The photo attached shows the best group, so far, after less than 100 rounds.

A very sweet barrel, so far.

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