The Las Vegas massacre that left 58 people dead is sparking a gun control debate surrounding an attachment used by the gunman known as bump stock.

It may have helped him kill more people.

"It will sound and run just like a machine gun and dump thirty rounds of ammunition in seconds," Jonathan Hirsch said.

The new spotlight on the attachment is creating a demand.

Hirsch, the owner of Adelbridge & Co. Firearms in San Antonio, said since the massacre people have been calling his store and asking about bump stocks.

"They are sold out everywhere, you’re not going to be able to find them,” Hirsch said. “Online they are going over $700."

The bump stock has become so controversial even the NRA released a statement endorsing additional bump stock regulations.