.  If the two go together to a licensed firearms dealer for the background check, it would be very quick, quite cheap...my last one cost $10..and the seller would have written verification that he/she sold the weapon to a "legal" buyer.  That process would innoculate the seller from any future "misuse" of the gun.  In my case, I consigned a rifle and a shotgun to a local dealer.  The shotgun didn't sell and to get it back from the dealer I had to have a background check.  10 bucks and no big deal.  

My suggestion would a) put the responsibility on the seller and b) allow those sales to relatives, neighbors and friends w/o a background check if the seller were willing to do so.  BGW: That verification could have a reference file number rather than the name of the buyer, however, before this law, personally, the private sales I've made of firearms have always had the buyer providing ID to me. I feel it's the sellers' responsibility to protect themselve from future issues. Gary Crum