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Old 04-02-2021, 05:14 PM
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Default Bullet Question **Pics**

A buddy of mine built an AR15 recently and bought a Bear Creek fully assembled upper receiver & BCG.
The first round didn’t eject, so he shot another and same situation...switched ammo brands and a third one did the same thing.
I advised him its not safe to shoot, and to email Bear Creek first thing Monday morning with pictures.
Can someone explain what causes this?








Old 04-02-2021, 05:19 PM
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Did he clean out the barrel and chamber before firing the first rounds? Did he inspect the chamber for burrs? It looks like the spent casing is hanging up in the chamber and the extractor is ripping off the bottom part of the spent casing. No excuse for that in a new firearm.

I suppose I should ask what kind of ammuition he is using.

Last edited by yarcraft91; 04-02-2021 at 05:24 PM.
Old 04-02-2021, 05:20 PM
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Are all 3 bullets cut/broken in the same place? One possible issue may be that the rifle is chambered only for .223 and he was shooting 5.56 which has higher pressures. You can shoot .223 in a rifle chambered for 5.56, but not the other way around, unless rated for both calibers.
Old 04-02-2021, 05:25 PM
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300 blackout? Any stampings on the barrel? Wrong barrel?
Old 04-02-2021, 05:25 PM
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Originally Posted by Retiredearly View Post
Are all 3 bullets cut/broken in the same place? One possible issue may be that the rifle is chambered only for .223 and he was shooting 5.56 which has higher pressures. You can shoot .223 in a rifle chambered for 5.56, but not the other way around, unless rated for both calibers.
I asked this question, and the casing says 5.56
and Barrel says 5.56 NATO
Old 04-02-2021, 05:28 PM
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Gas tube all lined up and not pinched? Iv seen failure to eject from miss aligned gas tubes.
Old 04-02-2021, 05:30 PM
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Here’s the other casings


Old 04-02-2021, 05:31 PM
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Odd. The casing is pulling apart like an overcharged belted cartride, but the 5.56 NATO is not a belted cartridge.

His rifle may have a defective chamber.
Old 04-02-2021, 05:39 PM
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All cases bulged and sheared in the same spot. Only guess I have is that the cartridge isn't going all the way into battery and the pressure inside the cartridge is expanding the back end and the chamber is acting like a shear and cutting off the cartridge.

Does a round slide in and out of the chamber easily without the bolt pushing it in?

For it to fire in that position, the firing pin would need to be stuck in the extended position.
Old 04-02-2021, 05:51 PM
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Originally Posted by maintenanceguy View Post
All cases bulged and sheared in the same spot. Only guess I have is that the cartridge isn't going all the way into battery and the pressure inside the cartridge is expanding the back end and the chamber is acting like a shear and cutting off the cartridge.

Does a round slide in and out of the chamber easily without the bolt pushing it in?

For it to fire in that position, the firing pin would need to be stuck in the extended position.
If that's what is happening, that is a dangerous situation.
Old 04-02-2021, 06:10 PM
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Pull the upper from the lower. Ensure that a round will fully seat and drop back out.
With the upper removed from the lower, see if the BCG will fully seat and then extract a round.
Lastly look at the chamber.

What is happening there is messed up. I've assembled MANY ARs and have never had this occur.
Old 04-02-2021, 06:36 PM
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bad chamberreturn it
Old 04-02-2021, 06:47 PM
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could be a number of things..... many already mentioned.

could be excessive headspace when locked. - check with go/no-go/field gauge or a full headspace gauge set....

to me - that looks like its either failing to lock properly, or the gas system is unlocking it early - either is a proper 'smith or factory test/fix.


could also be faulty reloading practices (assuming these are reloads... but it doesnt really look like it to me)
Old 04-02-2021, 07:26 PM
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Out of battery detonation. There’s no way those cases were fully seated when they went off. If they were fully seated when fired then the gun unlocked prematurely while there was still way too much pressure inside the bore.
He’s lucky he didn’t blow his gun and himself up.
Old 04-03-2021, 03:54 AM
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One of two problems. Headspace or chamber geometry issue causing the rear portion of the case to be in-supported. Second, the charge mass or formulation could be too high for the mass of the projectile creating too much peak pressures to rupture the case.

Only times I see this is over 100kpsi. It could be reused brass that is already fatigued but who knows. High pressure test for 5.56mm is what 85kpsi?

Call the ammo manufacturer.
Old 04-03-2021, 04:27 AM
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This is why I buy quality in whatever i'm buying, not bargain basement, sorry.
Old 04-03-2021, 04:38 AM
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Originally Posted by Hemi_Hammer View Post
Here’s the other casings


Ho-Lee-Fuk - DO NOT SHOOT !! Return upper ASAP
Old 04-03-2021, 04:47 AM
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OOB discharge like 7.62Kolectr said. No way the bolt was locking up on that rifle. Verily lucky it didn't destroy something.
Old 04-03-2021, 06:05 AM
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I am certain I would have stopped shooting the first time I saw a case like the ones pictured above. Where did the fired bullets land? Did they hit the target as expected?
Old 04-03-2021, 06:43 AM
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Originally Posted by GetReel View Post
Ho-Lee-Fuk - DO NOT SHOOT !! Return upper ASAP
This^^^^^^^

It would have gotten to do that one time for me.

Who cares what caused it or trying to figure it out.

Maybe look down the barrel and see whats happening.

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