Here is the convo I had with CMMG. Some good troubleshooting info here if you are having problems.
ME:
They are 36 grain. I believe it is a problem with the extractor. Even after the jam, I am not able to extract the cartridge by racking the charging handle. I have to manually pull the cartridge out with my finger nail. I believe the extractor is not able to close over the rim of the cartridge completely.
CMMG:
The extractor is not designed to extract live rounds, it is designed to be
blow-back operated. How many rounds have been fired through the unit?