All the pro gun people I know, self included, have more than that. There are more guns than people in America, but not nearly everyone is a gun owner.
The old estimates are bad, for example, 275 million new in to the market guns were counted by a system the BATFE introduced in 1999 for high volume manufacturers, importers and wholesalers, a total of 66 FFLs, that no academic had previously used in an estimate.