Barack Obama's 1st inauguration took place on January 20, 2009.
Oh, hooray for the red, white & blue!!
(red highlight and arrow added)
If that 310 million number is correct, it means that the first year of Barack Obama's presidency was an inflection point: It marked the first time that the number of firearms in circulation surpassed the total U.S. population.
Guns in America: The Business of Fear. (Reuters, 7/30/2012)
How the Gun Industry Got Rich Stoking Fear About Obama. (The Nation, 8/22/2012)