Nathan Brown posted this up.

Carnage of a polymer lower AR exploding!!! 8ft blast radius of pieces!!! Lucky no one got seriously hurt!!

I have not seen damage to a BCG like this before.

Below you can see the bottom of the carrier sticking down at an awkward angle.

Below is what was recovered from the last round fired.

It is truly a miracle that no one was harmed when this exploded. I cannot tell which make of polymer lower this was. I wonder how much destruction would have happened if it had been a forged or billet lower?