IMHO, this theoretically could be done. New bolt head would be required so that extractor and ejector were properly oriented, and ejection port cut made in reciever. Might even be possible to rotate original bolt head 180 deg., although welding and machining might be required. Would be relativly simple for factory to offer this, but given low number of guns of this type, probably not financially feasable. Safe shooting Edit: Bolt on M17s is unique to that firearm, although I believe extractor/ejector etc are standard AR parts