I have no dog in this fight. I think
E
erudite cricket
should rest assured knowing that buck warranties their product for life. They can, at any time, send the knife back for repairs or a spa treatment.
I pulled out my Buck 110 and my Schrade LB7. Both have gaps, maybe business card sized but likely not quite that big. Again, gapping isn't a large concern to me. Just a nicity. Keep the knife cleaned and oiled and you won't have issues.
My Schrade LB7 would not rattle no matter how hard I shook it. My Buck 110 didn't rattle with light shaking but with heavy handed shaking did make a slight audible rattle. Both are fairly old knives with not a whole lot of use on them. I would not send either of mine back or consider them defective. I likely never would've noticed without trying, to be honest. Based on my knives, my biggest concern for
E
erudite cricket
would be significant rattling in the closed position. If it bothers you, request a refund/replacement and see what you get with the next knife. But, again, if it doesn't bother you enough now or you are unsure if it's worth sending back or replacing, you can always send it back later if it ever does become an issue or a bother.
I hope, either way, that you end up with a knife you can carry, use, and start to love as we become attached to these pieces over time and they become our own!!