The Tennessee Bureau of Investigation reported running nearly 10,000 background checks for gun purchases between Friday and Sunday.
The actual number of guns sold could be much higher since a customer can buy multiple weapons at a time.
"It was the largest sales day that we have ever encountered. Never had we seen anything like it," Guns and Leather owner Dennis Williams said. "As a result of the president coming out and saying we have got to ban these assault weapons or so called assault weapons."
Those weapons began selling out on Friday.
President Barack Obama made comments about tightening gun laws following the mass shooting at Sandy Hook Elementary in Newtown, Connecticut on Friday.
A gunman entered the school and killed 26 people, the majority being children. He also killed his mother and himself.
"Typically the pipeline empties out this time of year and definitely now has emptied out," Williams said.
Before last week's devastating incident, yearly gun sales were already increasing. Guns and Leather saw around 15% increase in sales prior to the shooting in Connecticut.
Distributors started warning dealers that the availability of certain weapons and ammunition would be scarce in 2013.
Some retailers had already started limiting the purchase of certain ammo to preserve inventory for all of their customers.
Over the weekend the demand was so great some distributors opened on Sunday to fill orders, which is unusual.
"They had such a response from dealers ordering things over the weekend, because everybody was feeling the same crunch, the servers crashed and they called employees in to work," Williams said.
Ammunition sales were also high.
Guns and Leather typically sells 10 high capacity magazines in a weekend. This past weekend they sold more than 300.