I've got two SR22's both with about 2500 rds of Federal jhp's thru both. one SR has an o ring the other doesn't both of mine run great on the Ferderal JHP's. I had one to the range the other day ran 500 rds of Federal thru it with no problems at all. No fail to feed or fail to fires. I don't like Remmington goldens to dirty and have problems with them. I don't fine any difference in preformance between the one with thee o ring and the one without other then the one with the o ring has a buffered recoil feel to it.