Shooting my AR with the CMMG 22 conversion kit yesterday and about 200 rounds in had a \*POP!\*, saw a little flash and smoke coming out of the chamber. Bolt was jammed and when I pulled it back this casing fell out and realized I had an out of battery detonation. Aguila brand ammo. I wasnt sure if it squibbed or not but after removing the 22 conversion bolt and looking down the barrel of my AR saw it was dirty AF but clear. Later when I was cleaning everything the whole bullet came out of the CMMG bolt. First 100 or so rounds had no issues but I was using the SuperExtra HP in both my AR and 10/22 I was also shooting (poverty range day, lol). After going to regular Aguila, had a string of failures to eject, double feeds and other jams which I suspected was due to all the gunk in the barrel of the AR from the cat piss ammo. As it turns out, there are others who've had issues with Aguila so I'd say be wary if you have some from a couple years ago. This OOBD was on the last loaded mag so called it a day at that point (was also getting close to 90 in the desert).

Fair to say it got my attention and will remain very aware next time I go shooting with that ammo (or likely quarantine the 500 or so rounds left and shoot other stuff instead). Aside from that, the CMMG was really fun to use in my 20" A2 "clone-ish" AR and had some quality range time with my daughter (who got to learn how to clear jams)...!

Well, that's a first