I know that this is an old thread, but maybe someone will see it and give me some clarity or advice. I just bought a Silver Reserve 20ga. And I'm very glad to have it. I have not fired yet. But its serial number goes like this: TR200117**
To me, it looks like that falls into the range specified earlier in this thread as possibly needing attention. I called Mossberg today, and the guy on the line was very polite and patient. But he said that there are no potential problems I need to worry about. I gave him my serial number, and he sounded like he was looking it up. He said that it was made in 2005, and that there was nothing to worry about. I'm happy to trust him. But what I've read here makes me think that there must be something more to the story.
Any hints?
Many thanks
--C