What could have caused this?

>>32856591


its a piece of shit AR/thread

I'd assume it was a hang fire, the operator tried to eject the round and it went off as he was half way through.

A bee.

Water.

It was not under heavy firing/excessive heat. The shooter was unharmed. It's in a dry enviroment.

>>32856591
My dick. It couldn't handle the above nato spec pressure.

>>32856830
All joking aside, it could possibly be an out of battery primer strike.

>>32856591
>>32856595
considering the bolt lugs are intact as is the barrel, that round went off out of battery

How we won't know, but it wasn't locked up when it went off

the AR bolt doesn't allow the FP to hit the primer out of lockup, so it would have had to be a broken pin or potentially an extending primer that the bolt face smacked into

>>32856591
Underload cartridge.

>>32856602
not objektive

>>32856591

Shit like this is why I only use milspec greentip brass case ammo.

And I would only use hand loads if I did them myself.

>>32857000
I stick to wolf gold mostly
I would shoot steel case, but I don't want to cause any unnecessary wear to my rifle

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I dunno. Wasn't mud though!

Could huge amounts of oil caused it?

>>32857008
Its the ammo,and its not double charge since the mag didn't shit its guts out.
Thats flat out bullet that explodes because has too little powder for proper incineration.

L2 headspacing

>>32856839
How would that even happen?

>>32857042
>headspacing

That was milspec greentip and a genuine colt M4. I still don't understand what kind of weapon malfunction did that.

>>32857045
https://www.youtube.com/watch?v=-fJbezHgGBA

>>32856591
Even it couldn't contain the amount of freedom it was bringing.

>>32856591
The jews

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One more for eductional porpuses.
So who's fault it is to blame?

>>32858358
>So who's fault it is to blame?
I thought the poster above you was just bullshitting, but looking closely at that pic
>paracord sling attachment
>ducttaped mags
>extra-worn upper receiver high points
>dat dirt color
he just may be on to something.... My guess is the case was malformed by IMI because they decided to cheap out on the brass punches, or run them well beyond their longevity.

>>32856591

Twinkies

>>32858358

Probably got a very small amount of mud inside it and exploded, because that's what ARs do when the elements get inside them.

>>32856591
spider web inside the barrel

>>32858393
You are spot on.

Anyway this weapon went through the mandatory monthly armourer's check, and we agreed it's an out of battery detonation so it's cant realy be the weapon's fault.

>>32856591
Probably some mud or something clogged the chamber. ARs are prone to catastrophic failure when shit gets in them.
>inb4 b-but muh mud test videos
AR fags take note; this is what happens when you actually get something INSIDE the gun, rather than smearing mud on the outside.

>>32858448
>>32858416

this tee bee ach

>>32856640
Looks to be an out of battery detonation since all the locking lugs in >>32856595
are pristine.

Which would be bad ammo.

>>32858461

Do ARs actually explode from out of battery detonations?
My AK had one, and the only damage was a small scratch caused by ejecting the mangled case that was still being held by the extractor.

>>32856591
Is there a FP mark on the primer ? No : something happened to the primer.
Is there some brass still in the chamber ? Yes : can be underloaded ammo, if no, can be out of battery firing
Did the bullet came out of the barrel ?

>>32856591

https://www.youtube.com/watch?v=Oh1lyMyejpI

>bad primer
>implying

>>32858475
Depends entirely how far out of battery it is.
>mostly in the chamber, bolt just isn't locked
Cartridge can build the majority of its pressure, receiver is likely to explode (true across all patterns of rifles, be they AR, AK, boltgun, etc)
>half in, half out of chamber
Case sidewall will rupture and vent out the ejection port with minimal or no damage, bullet will likely lodge partway down the barrel like a squib because couldn't build enough pressure
>completely out of chamber
Case will rupture usually at the shoulder, gas and shrapnel will vent out the ejection port, very unlikely to cause damage

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>>32856591

some guy probably filled a case up with pistol powder and a 62-77 grain bullet and the dang ol gun went boom man and the bolt and carrier probably blew back from the pressure and the rest of the gas blew the receiver out maybe

>>32856591
>>>32858475
>Depends entirely how far out of battery it is.
>>mostly in the chamber, bolt just isn't locked
>Cartridge can build the majority of its pressure, receiver is likely to explode (true across all patterns of rifles, be they AR, AK, boltgun, etc)

But how could it fire if the bolt isn't fully locked?

>>32858635
Something fucky with the primer, like about a dozen people above you have already said?
>primer protruding significantly from brass
>firing pin protruding from bolt face when it shouldn't
>primer is damaged or defective
>debris stuck to either face of primer or face of bolt

>>32857007
>His aluminum you gun can't fire steel case without wearing down

AK-FAGS WIN ONCE AGAIN, HOW CAN AR-KEKS EVEN COMPETE?

>>32858475
>AK's are completely unharmed by out-of-chamber detonations
>Who would have thought that the AK's cavernous receiver actually served a purpose?

Despite all the due fellation that Eugene Stoner gets around these parts, Mikhail Kalashnikov's pragmatic genius never ceases to make my pee-pee hard.

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>>32858590

>>32856591
Having a plastic and aluminum toy

A single grain of sand.

>>32856591
>What could have caused this?
over pressure

the better question is what could have mitigated this. the answer is a billet 7075 upper.

>>32857000
greentip is the worst ammo to use for any application.

>>32856845
You can still see the case head stuck in the bolt face.

>>32858590
Nah, see >>32856595
The locking lugs are still intact. OoB for sure.

>>32858930
diff guy here. look at the carrier though. gas pressure split it in two, when the easiest path is out the case walls in an OoB situation. while the lugs didn't shear off, the backsides are mangled. I don't think it would have done this from being OoB. I'd say a way over pressure round.

>>32856591

improper maintenance.

Speck of dust

>>32856591

>bushmaster_after_cerberus.jpg

>>32856591
bad gun design

>>32858881
... it is intended to punch through car doors and stuff like that. Is it the worst at that?

>>32859550
Not that anon, but funny you mention that. I'm a somewhat self-proclaimed home mechanic, and took the door panels off both my front doors of my truck and installed ar550 torso sized shooting targets that I got for $50 each into them. My buddy gave me a large piece of bank teller glass, approximately 6 foot wide and 3 foot tall. I cut them to fit both doors (can't roll down). Don't worry it was a beater truck I got from the scrap yard and nigger-rigged to work as my "mad-max" truck. Also put a 3/4 inch steel plate in front of the radiator, and a beefed up brush-guard. It's a work in progress. I will take pictures one day.

>>32856591
a combination of tight tolerance barrel, loose tolerance bullet and an overcharge of powder.

>>32856591
>>32856595
CA compliant AR15 design in 2020?

>>32859754
Your door hinges are going to fail in short order, no doubt.

>>32859795
I accounted for that and found more of the same hinges at the scrap yard, it now has five hinges per front door. The thing is an absolute beast.

>>32856591
Nerve gas

>>32856591
>>32856595
Privates

>>32858696
Implying.

Youre an idiot if you think your ak wont blow up when a round is out of battery or the hadspace is off.

Ak headspacing is harder to fix than an ar headspace issue as well.

Link to every century ak, I.o. ak, and golani "galil" lol

>>32857088
>The jews
Unironically the answer. I mean look at this >>32858358 thing.

>>32860034

My AK didn't blow up when it fired out of battery.
The dust cover didn't even get knocked off.

>>32858358
Jews for sure
As they are responsible for every atrocity

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>>32860291
Who the hell let Pvt. Cohen clean those weapons ?

>>32858856
My thought as well

>>32859006
I tend to agree, since the barrel extension is all blowed off (sic)

>>32860633
Me again, I realized my mistake when. Looked again.

>>32856591
a strong case of America

>>32859754
>>32859826
Sounds fucking awesome.

>>32856591

Bees.
Bees did it.

>>32856591
>Overused parts
>armorer processing hundreds of rifles misses something or they gundeck logs because fuck it.
>Catastrophic failure

Glock fans should be happy the Army didn't go with the G19 because in 15 years you would have been seeing nothing but problems thanks to the shit poor maintenance scheduled on small arms.

>>32856591
That garbage bipod.

>>32857007
>Falling for the extra wear meme...

>>32859754
>blocking the flow of air to your radiator with a steel plate
Enjoy your blow head gasket

>>32859826
>five hinges per front door
Jesus Christ you are a fucking madman.

Probably chambered a 300blk round through it.
Dumb yanks.

>>32861177
It's welded to the back of the brush guard, about 4 inches from the grille. Plenty of air flow.

>>32856591
being a dumbass

>>32856591
I don't think the bolt unlocked after the shot. This caused the gases from the gas tube to push against a bolt carrier group that was locked forwards, which forced them to (lol) blow your upper receiver in half (nice pic btw). The remaining backwards pressure on the unlocked bolt severed the cartridge at the case head, fused it onto the bolt, and the remaining pressure blew your extractor off and then emptied your magazine for you, while sending the bolt carrier group into the buffer tube on a crazy, unguided angle lodging it in place.

Based on the amount of wear on the rifle, it was probably a failure of the following parts which could cause a failure of the bolt to unlock:

Cam Pin
Firing Pin
Retaining Pin

Or extremely dirty conditions on the bolt face or in the chamber.

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>>32861395

>>32861288
My friend works for a local scrap yard, when I told him what I was doing he started setting back parts and I would just go pick them up for free. Got the beater truck for $300. So I only have around $500 at most in the truck. It was well worth it imo.

>>32858358
You guys Marines using their ammo in Israel? Been there,but good hting we brought a lot of our own shit.

>>32857088
Best answer selected.

"Muh shekels" compromiss in design meet real world conditions.

>>32860231
See
>>32858586

It's not up for debate you autist. If your rifle didn't blow up when a round went off OoB, then the round was mostly out of the chamber.

>>32859754
>took the door panels off both my front doors of my truck and installed ar550 torso sized shooting targets that I got for $50 each into them.
I'm so glad I'm not the only one who had this idea

>>32858475
Physically impossible for an out of battery firing of an AR during normal operations. The firing pin is only long enough to protrude when the bolt is collapsed and in battery. Even if a dirty firing pin is stuck, it's not long enough once the BCG pulls back. Anons who said OBD are full of shit.

Only time a OBD would happen would be a cook-off when the rifle is overheated maybe after like 800 rounds full auto.

Based on pictures, I think it's bad ammo. It's not headspace since in AR, bolt and BE are headspaced and don't change.
It's not a double charge or burst case because the bolt is in tact.
It looks like the primer wasn't seated properly and the jet came through the firing pin channel and split the Carrier.

That's my guess. Check the batch for loose primers.

>>32862683
You don't think it was a part failure at all? Even a hairline crack in the cam pin before the shot?

>>32863122
Broken cam pins don't destroy rifles m8. Otherwise every AR would be pieces. I think the primer blew out and the explosion came back through the firing pin channel. Maybe the dust cover was closed and exacerbated the pressures. The carrier split and pried the upper in half. This is why the BE looks fine and as if the upper just came apart around it.

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>>32856591
300BLK in 5.56 chamber?

>>32865529
>>32861395

>>32856595
the bolt head is in the rear position and the front of the bolt carrier is ripped open as if the cam pin ripped tore one part of the bolt carrier sideways

>>32858461
>>32856845

the locking lugs are not pristine. look at the rear left side of them in the first pic. they are torn at an angle. also notice how the bolt carrier is ripped open sideways by the cam pin. it myst have moved the bolt backwards into the bolt carrier while the locking lugs were sliding backwards along the corresponding surfaces in the locking area so the bolt couldnt move sideways as it normally would - thus breaking the front carrier apart. The detonation must have happened while the gun was almost chambered or unchambered with only a tiny bit of contact between locking lugs and the chambers lugs.

if all thats true then it could either be hangfire or maybe even slamfire?