Originally Posted by
Gm54-120
Western supplies them for the primer pocket. Not really needed if the head space is set correctly. You can buy a firing pin bushing shim kit for around $5 that is a more permanent solution. O-rings don't last very long but plenty long enough for a average range session or a hunt.
i generally don't like little parts like that could fail or you can lose track of. i like the sound of the shim kit better !thanks for info !