The internal specs of your bcg are f'ed up. The rings are only a part of the system. Swap the carrier that works with the bolt that does not. That will tell you everything you need to know about what is going on. If it works then your newer carrier is the problem. If not then it is your bolt causing it.
And to just prove it, swap the bolt that does work into the carrier that does not right now.
Just make sure which parts go where they need to.