Up until the collapse of the economy in about 1980 the used racks were full of everything and anything you could think of. I remember in handguns we were getting S&W and Colt .32 revolvers faster than we could sell them. The H&R 22s were common and worth practically nothing. In long guns the lever actions were slow movers and single barrel shot guns were dogs. Now all this stuff is collectors items.
The Rust Belt got hit hard and for a few years buyers from cities bought up all the good stuff and it’s now out of the area.