Out of Battery Detonation....

[protohyp]

....just doesnt happen in an AR

So I'm leafing through editing some of my videos and I came upon this to dispel the rumors that an AR 15 can have an OOB detonation.

It just wasn't designed this way. You can dispute it all you want but heres a little video for you

https://youtu.be/u4u1eT_UprI

now if you toy around with your BCG and do some crazy stuff to it then I can't speak to that but this is about 15000 rounds uncleaned for a while rifle which is why my BCG was getting hung up.

[MarikinaMan]

[protohyp]

[MarikinaMan]

That’s most likely a squib. You see he’s pounding the forward assist each time he malfunctions most likely pushing the squib forward until it goes into battery.

If it blows up upon loading the next round that’s most likely a hot load or a failing case but the OOB never has a chance for the pin to hit the primer


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As far as I know, the bolt can close but possibly not lock. The carrier has to collapse into the bolt so that the cam can turn it. In the previous condition, the hammer can still strike the pin and cause an OOB. I am not sure if the timing of the hole the hammer goes through on the carrier prevents this.

[protohyp]

As far as I know, the bolt can close but possibly not lock. The carrier has to collapse into the bolt so that the cam can turn it. In the previous condition, the hammer can still strike the pin and cause an OOB. Cleaning is advisable

you know we all get lazy cleaning.

My thought is the minute amount that the pin has to travel in the window that it can effectively strike the primer doesnt really put the casing out of battery.

[RickD427]

....just doesnt happen in an AR

So I'm leafing through editing some of my videos and I came upon this to dispel the rumors that an AR 15 can have an OOB detonation.

It just wasn't designed this way. You can dispute it all you want but heres a little video for you

https://youtu.be/u4u1eT_UprI

now if you toy around with your BCG and do some crazy stuff to it then I can't speak to that but this is about 15000 rounds uncleaned for a while rifle which is why my BCG was getting hung up.

Anything that is made up of mechanical parts can have a malfunction. The video that you posted doesn't change that fact. For that matter, the naval architects that designed the Titanic made her "unsinkable." Same fallacy involved there.

I had to take action on an administrative investigation where a M-16 weapon had an "out of battery" detonation on a range at Camp Pendleton.

It can, and has, happened. Even if Dr. Stoner did not intend for it to in the weapon's design.

[protohyp]

Anything that is made up of mechanical parts can have a malfunction. The video that you posted doesn't change that fact. For that matter, the naval architects that designed the Titanic made her "unsinkable." Same fallacy involved there.

I had to take action on an administrative investigation where a M-16 weapon had an "out of battery" detonation on a range at Camp Pendleton.

It can, and has, happened. Even if Dr. Stoner did not intend for it to in the weapon's design.

So was it conclusive that it was an OOB? It would be hard for me to believe that it could be case head separation on once fired brass.

I guess again I should reiterate that if a BCG hasn't been modified or parts are missing it shouldn't happen. On normally operating even dirty rifles shouldn't happen. You make a good case that anything can happen but to me it would have to be extraordinary for it to happen. Just my opinion.

[RickD427]

So was it conclusive that it was an OOB? It would be hard for me to believe that it could be case head separation on once fired brass.

I guess again I should reiterate that if a BCG hasn't been modified or parts are missing it shouldn't happen. On normally operating even dirty rifles shouldn't happen. You make a good case that anything can happen but to me it would have to be extraordinary for it to happen. Just my opinion.

Yes, it was clearly an OOB discharge. The weapon involved was autopsied by a couple of expert examiners.

You're right it "should" not have happened, but it did.

[Blade Gunner]

Was getting that one thirty cent round to fire so important. Multiple attempts using the forward assists and charging handle should have given him a clue something was amiss.


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[Carsgunsandchics]

You can get a out of battery detonation by having a high primer. Or even a broken firing pin or debris in the bolt holding the firing pin.

[dwinters14]

Anything mechanical can and will have failures where they shouldn't. But on the whole if the ar-15 was designed to prevent this from happening and firearms manufacturers are making their weapons to that spec, and the end user is responsible in taking care of the firearm the chances of an OOB firing should be slim.

Much like saying you can shoot yourself with a ricochet and many other less than likely, but possible scenarios.

My question is what is the relevance of this? Is it going back to the discussion about the halves being separated?

[protohyp]

Anything mechanical can and will have failures where they shouldn't. But on the whole if the ar-15 was designed to prevent this from happening and firearms manufacturers are making their weapons to that spec, and the end user is responsible in taking care of the firearm the chances of an OOB firing should be slim.

Much like saying you can shoot yourself with a ricochet and many other less than likely, but possible scenarios.

My question is what is the relevance of this? Is it going back to the discussion about the halves being separated?

[ar15barrels]

I am not sure if the timing of the hole the hammer goes through on the carrier prevents this.

The hole in the carrier stops the firing pin from reaching through the boltface if the carrier is back from the barrel extension by more than the length of the firing pin protrusion.
Firing pin protrusion is under 1/16".
The carrier has to move rearward more than 1/8" before the cam pin is engaged to BEGIN unlocking the bolt lugs from the extension lugs.
The full unlocking does not occur until more like 3/8" of bolt travel.

It's not possible for the firing pin to protrude beyond the bolt face and strike a primer of a chambered cartridge when the lugs are not FULLY locked into the barrel extension.

[colt11]

I had a kaboom in my 9mm AR using Blazer Aluminum case ammo. I believe the problem may have been from a 9mm lighweight hammer the original builder installed that was being thrown back so fast it did not catch and would follow the bolt back. I installed a heavier hammer and never had another problem. Fortunately the 9mm is a lower pressure round.

[MarikinaMan]

I had a kaboom in my 9mm AR using Blazer Aluminum case ammo. I believe the problem may have been from a 9mm lighweight hammer the original builder installed that was being thrown back so fast it did not catch and would follow the bolt back. I installed a heavier hammer and never had another problem. Fortunately the 9mm is a lower pressure round.

I don’t get the part where this was a kaboom? Ar9s are blow back. A stuck firing pin would just turn it to full auto. A hammer with no disconnect would also go on full auto. Can u describe what happened in more detail?

Below is another CLICK and NO BANG kaboom. New ammo experienced head separation. JP supposedly said they think it was overcharged factory ammo. I’m just thinking that it’s too coincidental that the detonation happened after the click.