Do not allow this ploy to disturb your domestic tranquility. It's not worth the blood pressure points. It has obviously already consumed more energy than it is worth. Put your feet up, relax, and rejoice in the fact that she no longer has to put up with the antics of old what's-his-name.
Your wife might make a very short reply (if correct): Any property you left in my possession became mine after 30 days. At this late date, you have no claim to any such property.
That does not stipulate that she still has the AR, and it puts a stop to his claim. Then ignore him. Last I had any need to check, claims under about $1500 have to go to Small Claims Court. I think that is his only recourse. Usually, that claim would have to be filed in your home county, not his. He would have to travel there to appear in person, and he's not going to do that. As stated, neither law enforcement nor the ATF is going to have the slightest interest in this civil issue.
