WeaponsMan: Total US Firearms: Not 300 Million, but 412-660 Million?

Makes sense to us.
Via WeaponsMan:
The typical estimate of the total number of firearms in the USA is about 300 million, depending on whom is queried.
The numbers are all over the place, and many of them seem to recursively refer to one another, not exactly building confidence in the rigor of their development. But they seem to cluster around a Narrative-friendly 300 million. But what if that number is wrong?
We believe that the correct number is much higher — somewhere between 412 and 660 million. You may wonder how we came to that number, so buckle up (and cringe, if you’re a math-phobe, although it never gets too theoretical): unlike most of the academics and reporters we linked above, we’re going to use publicly available data, and show our work.
Read more here.