This video was recently brought to my attention. I don’t know how long ago it happened or where?
I have seen many rifles ka-Boom. AR’s even. Usually what I see is a “blow-out” down the magwell and out the ejection port.
That is not what happened here. The upper completely blew apart. Up to and including separation near the rear hinge-pin.
So what say you? The dreaded 300blk in the 5.56 barrel? Or something else gave way and possibly lead to an out-of-battery-detonation? OOB.

Special note: The hammer is left in the fired position. Is that because of the 3rd pin sear? Or did the gun detonate when locked and not get a change to cycle?
CLICK HERE to see pics of another 300blk KB in a 223. Not nearly as violent.
Sincerely,
Marky
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