I agree with these guys, I am surprised that the weapon cycled as well.
my dad made me deathly afraid of that situation when I was younger so I watch for it constantly.
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USA Ammo was the one I was thinking about.
http://www.ar15.com/forums/t_3_16/54...auer_P556.html
of course, it's always possible that after the squib, the operator did not realize what had happened and charged the weapon. always better to check the weapon after an oddity.
Was the barrel really hot, the customer dumping mags when that happened?
It has to be a barrel obstruction of some kind, because when a round has been charged with pistol powder(there's simply not enough volume in the case to double charge) or the bullet is set way too deep and raises pressure the bullet never makes it that far down the barrel before the pressure gets high enough to start ripping shit apart.
The receiver is intact, the bolt is intact, and the damage to the barrel is consistent with an obstruction. I'd wager relatively big money that there was nothing abnormal about the round that did it, just something abnormal with the one that came before it.
A range rifle with an unknown history as far as how hot the barrel has been -- if it has been overheated ONCE the molecular structure of that steel is permanently changed and stressed (not for the better).
Combine that with a single over-charged or squib load event and you will get a split barrel exactly as photographed.
I'm thinking squib too. Make sure to update us when you can.
Sure looks like a barrel obstruction to me.
Doesn't an over pressure round failure in an AR blow the extractor and take out the upper too in most cases? Just trying to learn here.