Been there, done that. The only 223/222 bolts or bolt heads I have seen or been able to find that have the band-type extractor do not have a plunger ejector built into the bolt face. That means you have to retrofit to the flipper-type ejector on the side of the receiver. On both guns I have converted to 223, the slot for said flipper ejector was too short for the flipper, and I had to mill out an extension for the slot in the side of the receiver.