By Dean Weingarten A writer for The Trace recently complained about the numbers of guns Americans own. From twitter:Due diligence is indicated. The 270 million number is over a decade old and rather low. We know better now. The best current number is there are over 400 million private firearms in the United States.You can see the 270 million number was published in 2007.From smallarmssurvey.org:The 270 million number is repeated on the anti-Second Amendment site smartgunlaws.com, for the Law Center to Prevent Gun Violence. The link fails to mention the estimate from the Small Arms Survey was done in 2007....