The radio industry is pretty desperate for revenue.
If they’ll take ads for herbal male enhancements and shady house-flipping seminars, they’ll book an ad for anything.
These shows are almost like a Craig’s List over the air. I worked at a small station that had such a program. In the 70’s it was called Tradio. No charge to callers who called in to sell garage sale type items over the air. Sometimes it was to announce a garage sale with a short list of items that might attract people to the event. But even then, the station excluded firearms, bedding, food and soft goods which I believe referred to things like stuffed animals from being marketed.
It shows how ideologically driven the TV networks are.
I generally do not watch TV, but I do not recall seeing ads for firearms on the TV, and I remember a high level NRA executive told me the TV networks refused to sell them time. That was about 1992, as I recall.