There is simply no way to come up with any kind of accurate, reliable figure.
Guns have been coming into this country since before we were a country. and in fact there was a "study" a few years ago which concluded that private gun ownership among the colonists was extremely low. Literally, according to that study almost no one owned guns in colonial America. And the same held true as far as the study went after the Revolutionary war, as well.
Why did they conclude that???
Because of what they studied. They studied the surviving wills of the colonists, and found that guns were almost never mentioned in them. Therefore, they concluded that since guns were so rarely mentioned in the last will & testaments of colonial Americans, those colonial Americans didn't have many guns.
Anyone else see the flaw in that logic??
Another point to consider is that any poll is vulnerable to the "screw with you" factor. People will intentionally answer in ways intended to distort the poll.
If someone asks me if there is a gun in my household, I will answer honestly and truthfully, "no, I do not have
A gun in my household."
That is, assuming I just don't tell them it's none of their business and to
bugger off you evil get! 