Earlier quoted context omitted.
And I pointed out why your source is utterly unreliable. I'm not going to provide another source, because there are no reliable sources in this area. The figure of 270 million guns total is somewhat more reliable because there's at least some idea of how many have been manufactured.
Think about it for a minute. How likely is the average gun owner to answer truthfully when a stranger calls them up and asks if they own a gun? Hint: not very. We could try using the Fermi estimation technique ("how many piano tuners are there in Chicago?"). 270 million guns / claimed 80 million gun owners -> mean number of guns owned per owner is ~3.3. That seems high. Most gun owners I know own one gun. Some own tw…
I have to agree with suresk people, out of all of the folks I know, the number of guns is either 0 or >1. I don't know anyone with just one gun. I suppose if you divided the number of people in a household by the number of guns you may get a number closer to 1, but that means assigning gun ownerships to babies.