Catastrophic AR failure(now with pictures)

Well, it happened, to me. Let me be the first to tell you if you ever think "it will never happen to me", you're wrong, or at least I was.
I was shooting yesterday, had gone through one mag, started into a new mag and several shots down range, pulled the trigger and "click". I dropped the mag, ejected the round, visually inspected it and didn't see anything wrong with it that I could tell. I locked the slide back, manually dropped the round into the barrel and dropped the slide. Aimed the gun and BOOM.
The upper is toast, the lower is fine and I think that is only because the mag was not in so the pressure had somewhere to go down, although some of the shrapnel ended up in my arm that had to be dug out and small pieces hit my stomach, looks like I walked though a brier patch.
In the end, I am thankful that I am okay and feel I got lucky.

Now for my questions.
Any clues you can give me to look for would be appreciated. I can say that I did look in the barrel and I do not see any damage nor are there any bullets stuck. My first thought was I had a squib then the second round blew up but would there be enough to push both bullets out IF that was the case?

Yes, the rounds were reloads but no way it could have been a double charge as that spills out from 223.
As I said I looked at the round and didn't see any cracks but the naked eye cannot always see those so if a case had a crack say in the middle, not the neck, could that cause it to blow up like it did.
I know I will never know what caused this but I sure wish I could know so I could try to prevent it from ever happening again.

Do you have a log indicating how many times the case had been reloaded?
 
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