I only have my 2 firearms and since I'm not an FFL or someone who buys and sells guns (because once I buy it, I own it for life), I still have my rules for selling just in case I ever do sell one for whatever reason because I've given thought in advance as to how I'd handle the sale process:
1) PTP not allowed. Anyone can get one without training, therefore rule 2 comes into play.
2) Must have a current and valid Minnesota Permit To Carry (PTC) (They at least have to go through some sort of class to get the PTC, hopefully it's a good one. No such thing exists for a PTP.)
3) There will be legal documentation prepared by a lawyer I use, signed and witnessed listing the names, addresses, phone numbers of both parties. The documents will be notarized by a notary if possible at the time.
4) A photograph will be taken of the buyer's driver's license and PTC.
5) Cash only in full.
6) All rules are non-negotiable. Don't like it? I don't care. Don't buy a gun from me. It's about covering MY butt, not yours.