+1
This is what the majority of people want to see happen, accountability and checks for private sales. You check if that person is a felon, like any normal retailer would have to do. If you don't and it's found that you sold it to them with no check, then your ass is in trouble. If you did do a background check and they're clean and sell it to them but they kill people, then you did your duty and should not be in trouble.