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Case head failure. Happened to me once with factory reloads. Trashed the upper, B/BC/CH, and mag. Can be caused by over pressure load, a case that has been reloaded too many times, or firing out of battery. Could be one or a combination of these.
In your case, I'm guessing out of battery. See that black soot ring all around the base of the case and how it is bulged out, while the rest of the case remains clean and appears normal? You wouldn't have that black ring or bulging if the case were fully seated in the chamber when fired. Typically with an over pressure load, the end result is much more catastrophic. When mine happened, bottom of bolt carrier was split, and carrier itself was canted inside the upper receiver and completely seized up. Sides of lower receiver in magwell area were bulged out. Lower still ran without a hiccup when mated to a good upper.
Personally, I try to stay away from cheap factory reloads.
Last edited by DJ Urbanovsky; 11-03-2016 at 11:44.
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