I used the Mossberg warranty on my Silver Reserve II...
Bought it from a dealer, opened the case to make sure everything was there, but didn't check the wood. Came home and there was an unfinished edge on the forend. Don't get me wrong, it was going to be my trap gun, so I knew there were going to be marks... but not on a brand new gun.
Mossberg was very good, and the representative I talked to wanted to check with his supervisor on whether they were going to bring the gun back or just send out a forend. While he was doing that, I grabbed some snap caps and tried working the action. I forget which barrel it was, but when one fired, the action was impossible to open (fired both, or just that one; if I fired just the other, opened fine). When the representative heard that, he emailed a label to get it back.
Got it a few weeks later, and looked/functioned perfectly. I have about 400 rounds through it, with no major issues (had one failure to fire on Federal; had a primer strike mark, so reloaded it and went off the second time).
I feel good with the shotgun now, but if anything else occurs, I'll get it back to Mossberg. It may be Turkish made, but when Mossberg stamps their name on it, they better make it right.