The breech plug in my muzzleloader seemed to be fouling more of late. I phoned Thompson Center and asked if it were possible for the seal rings to wear out. The TC guy said yes and that he'd ship me new ones (no hassle, no charge and he threw in an o-ring; I liked the guy) and they arrived today. I removed the old ones and then snapped this pic. Not only were they worn about .012" but I was missing all of one and part of another.

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What would Porter Rockwell do?