In 2009, the Congressional Research Service estimated that Americans had 310 million firearms. Since then, and since Barack Obama has been in office, there have been 129.6 million background checks conducted; with the vast majority done on new weapons being sold. Thus, under Obama's watch, there has been a 42% increase in the number of guns purchased in just 7 years. Quite the record.
Smith & Wesson, Remington, Ruger and the rest of the gun manufacturers are really going to miss this President when he leaves office next January. Of course, he still has another year before that to improve on his 42% record. Probably close to 50%.
Number of Guns in U.S.: https://www.google.com/search?q=number+of+guns+in+the+u.s.&ie=utf-8&oe=utf-8
FBI Background Check Statistics: https://www.fbi.gov/about-us/cjis/nics/reports/nics_firearm_checks_-_month_year.pdf
Smith & Wesson stocks peak, gun sales rise amid Obama's actions on firearms: https://www.rt.com/usa/328037-smith-wesson-gun-stock-sales/