If your relative thinks he is going to get the rifles back when he's flush again, you are looking for big bad feelings.
Have him take the rifles to a good shop that does consignment sales.
Sayonara
If your relative has kids, you could buy them and then figure you have a couple years of Christmas/birthday gifts in the safe all ready to go. They might mean a lot more to his kids (or grandkids) than you could know.
The chair is against the wall has a long mustache.