What percentage do you consider common? And if you're interested why don't you do some digging and give a graph of gun ownership over those 240 years. It might actually be interesting.
Go ahead an school me. I can't wait for the sources from one of Bloomberg's antigun groups, or out of the wing of Harvard he funds for the same effect. PLEASE make it something from Hemmenway, I do so love his flavor of "science".
Gun ownership has always been common. I didn't say more or less common than any point to compare to.
We're lucky it's more common now than in previous points in history. You just don't know it yet.