We noticed a significant safety malfunction on my son's 40-year-old model 500 20 gauge a little while back. I emailed Mossberg. They told me to send it in. They repaired and shipped it back on their dime in a couple of weeks.
I understand the need for good PR when it comes to safety features on guns, but repairing any problem on a 40-year-old gun for free is remarkable in my book.