Sell guns? I've never considered that... What a concept!

Here in Colorado, unless the laws have changed, they simply have to be a resident over 21.

On the rare occasions that I part with a gun, I prefer to sell to a friend or relative that I know well. Otherwise, I let it be known in one of the groups I belong to (church, shooting range, club, etc.) what I have for sale and ask around about anyone that expresses an interest before I sell it to them.

Firearm's Transfer Laws and Regs

This should give you some idea what to expect, depending on where the transaction occurs. As you can see, it is still relatively easy in this country to buy and sell firearms through non-commercial means.

I've always preferred to sell through a legitimate retailer via consignment. You have a captive market, and your privacy is preserved. You also stand a far better chance of keeping the firearm out of the hands of malfeasants.

I'd go for having any sale recorded through a licensed dealer. Much less likely o ever have anyone come back and ask you where the gun is located. If someone asked, the record is an answer that stops further questions. I would not want to have anything happen with the new owner. However, with criminal liability now existing for having a gun stolen from you, I'd sell it with the best records I could establish.

The one concern with selling to a private individual is that if they do something unfortunate with it, you might get a visit. Personally, I like to sell either to someone I know or back to a dealer. Problem with selling to a dealer is that you'll almost definitely get less than you want for it.

Just carrying anything through a gun show has always gotten me a lot of inquiries, from dealers and individuals alike.