Hasn't been but since 1986 that they would *sell* a gun to anyone who walked in the door. I have a nice 1911A1 that was the last gun I bought from a dealer before the "background check" became manadatory for handguns, and a "serious social purposes" shotgun that I got before the check was required for long arms. Plus a nice WW-II carbine that I bought with no check, since it was from a private seller, not a dealer.
The receiver for my AR also did not require a background check, even though I bought it just over a year ago. Bought it from a dealer too.
Brain fade. That was when you could last buy a newly made machine gun. 1994 was when the "Brady law" went into effect requiring all those useless background checks. So 16+ years ago. Out of the 219 years since the Bill of Rights was passed.