I'd bought and sold several used long guns as a teenager. Legal without any parents signature in those days in my state.
First new gun that I bought with my own hard earned money, was a S&W model 19 with a 6 inch barrel. Walked into a West Texas hardwire store, paid cash, and walked out the door with the revolver and a cash register receipt. None of those silly background checks either.
I've still got it and it's had many thousands of rounds of ammo through it. If memory serves me correctly, I paid about 120 bucks for it.