There are not a lot of facts on this one. However in most of my reading the majority of AR blow ups where due to two reasons. Wrong powder used or over charge.
The only mistake I ever made that came close to blowing up a gun was an overcharge. I swear to this day I checked everything and I was carefully. When I check the reloads I found several that had an overload charge.
I have read about the other issues such as out of battery and head space. However depending on the information read it isn't a fully 100% supported reason for blow ups.n Some even try to show proof that an out of battery can't happen.
I do not have the experience to argue one way or the other on these two issues.
If you search there is a lot of info out there on AR blows ups. Some that I remember the most is using pistol powder by mistake, overloaded factor load, over load by self and bullet stuck in barrel.
I'm not going to guess on yours but like I said thereis a lot of info out there.
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