HARLINGEN – Less than a week since the mass shooting in Las Vegas, lawmakers and the National Rifle Association are taking up a gun control debate centered on a very specific issue: bump-fire stocks.

Bump stocks are a legal gun modification making legal semi-automatic guns fire almost like banned automatic weapons and they’re flying off the shelves.

CHANNEL 5 NEWS called around to gun shops in the Rio Grande Valley on Thursday to ask. We struggled to find sellers with the product in stock.

Some sellers we spoke with believe the spike in sales could be linked to the possible ban on them talked about in Congress and by the NRA.

“I’ve had a couple in stock that honestly I’ve just had because I couldn’t sell them because normally they’re not very popular,” explained Brian Guerra, owner of Lone Star Guns in Harlingen.

Now, the story’s changed.

“All my suppliers are completely out,” Guerra said.

Guerra has operated his business for six years. During that time he said he’s only had two requests for them. Now he’s getting up to 20 a day.

Lawmakers of both parties have suggested bump stocks should have tighter control or be banned altogether.

A new bill was introduced this week, the Automatic Gun Fire Prevention Act.

It’s a bill that could close what some legislators are calling a loophole, allowing semi-automatic weapons to be modified to fire at a faster rate.

The NRA issued a statement Thursday, calling on the Bureau of Alcohol, Tobacco, Firearms and Explosives to review weather bump fire stocks comply with federal law.

CHANNEL 5 NEWS reached out to the Texas State Rifle Association. They said at this time, they’re standing behind the NRA’s call for new rules or regulations on bump stock devices.

The Automatic Gun Fire Act can be read below.