Hello all, I have a Ar9 that I have about 5-600 rounds through. It’s worked well after breaking it in some where I was having a failure to eject in the first 100 rounds. Today while shooting I had the only out of battery explosion since owning the firearm. It blew the mag out of the well and had a shredded shell casing in the action. The round cleared the end of the barrel and short of the mag being blown out of the gun I’m not sure if it felt any different. I have a ar9 specific drop in trigger (Edit CMC trigger) as well as ar9 buffer spring and heavy buffer. Any insight of what to look at and check would be appreciated.