[img]http://ie.yimg.com/3/4a25da78/h/7ba4b16a/kaboom008.jpg[/img]


More photos here. I hope the guy didnt get hurt.

[url]http://photos.yahoo.com/bc/quarterbore?d&.flabel=fld13&.src=ph[/url]

The bolt is still in battery.  Now that is quality!

Is that the carier split in half?!?!? Woh!!!

Who owns that AR?

Is that what it was?  I couldn't find an explanation.  I thought maybe the shooter fired a subsequent round into a squib load.

Regardless, that's ugly.

That's not an RRA I hope!  Haven't even got my LEGP yet and I'm having nightmares!

Bradd

Can anyone tell if the lower is bulged ... I probably cry if I blew up one of my Prebans...

Ryan

Wow! I didn't know a carrier would split right down the middle like that!

Just shows you the forces at work, huh?

[b]What you do expect out of a .40 S&W Glock, they just do that all the time!






Oh wow, it wasn't a .40 Glock afterall.[/b][;D]


(And this is for all you .40 Glock haters - [-!-].)

Observe:
The environment- Cold, snow.
The failure- excess pressure within or failure of bolt carrier to contain pressure.
The gas rings- distorted and expanded out of slot.
The position of bolt cam- rotated just under gas tube.
The gas tube- no distortion indicating primary effects of overpressure, possible slight bending caused by secondary effects.

IF this is not the result of a bad handload such as excess loading or wrong powder, some possible causes might be:

The cold- causing lubricant failure to slow movement of bolt and excess pressure to build within bolt carrier.

The cold- causing depressed primer ignition and allowing unburned powder to pass through gas tube into bolt carrier, possibly accumulating and/or ignited by a subsequent firing.

The snow- inadvertant contact with muzzle causing obtruction to barrel and excess back pressure into gas system.

Notice that the bolt is rotated nearly out of battery. This could be because of firng before fully in battery but more likely the bolt was not prevented from rotating because of normal chamber pressure, or excess chamber pressure was not enough to jam bolt against barrel engagement. The bolt carrier began its normal rearward movement, rotating bolt to its present position, almost disengaged from barrel. As pressure built, bolt carrier failed and expanded. The expansion was sufficient to disengage carrier from bolt cam before bolt rotated sufficiently to disengage barrel. The bolt stopped rotating and remained engaged,and chamber pressure did not escape into reciever. All of the observed effects of over pressure are either from excess pressure through gas system into bolt carrier, or a secondary detonation within the bolt carrier, or failure of bolt carrier to contain normal pressure.
Alternativley, excess chamber pressure could cause bolt to jam rearward, increasing friction of rotation slowing rearward movement of bolt carrier and causing excess pressure to build in bolt carrier.

I sure hope no one was hurt.
I mourn the loss of an AR.

[heavy]

I can imagine what 26 grains of Tite Group would do to an AR...KBoom!

handgun powder?
ive used unique powder for 55 grain loads for years with nary a problem before i switched to blc2.