Under pressure from activist groups to issue regulations banning bump stocks, the Bureau of Alcohol, Tobacco, Firearms and Explosives announced this week they would leave that decision to Congress.

That sets the stage for what could be an epic battle on the House and Senate floors, between pro-gun Republicans and anti-gun Democrats and these Republican sellouts who have announced plans to move ahead with gun bans.

The call for a regulatory review of bump stocks didn’t come from Michael Bloomberg or one of his anti-gun groups.

It came from the National Rifle Association.

In the wake of the shooting, Republicans and Democrats called for restrictions on the device, and the National Rifle Association suggested that the ATF find a way to issue a new regulation prohibiting the device,” Washington Examiner reported.

House Republican leaders blamed the BATFE for the availability of bump stocks.

We are still trying to assess why the [BATFE] let this go through in the first place,” said House Speaker Paul Ryan. “What happened on the regulatory side. It makes sense that this is a regulation that probably shouldn’t have happened in the first place.”

Nine Republican senators also asked the BATFE to ban bump stocks.

We recognize that it is impossible to prevent tragedy and acts of ‘pure evil,’ in the words of our President. We believe, however, the tragic events in Las Vegas brought to light an issue from this past Administration that we respectfully request that your Bureau swiftly review,” reads an Oct. 6 letter from Republican Senators John Cornyn, Dean Heller, Tim Scott, Joni Ernst, James Inhofe, Johnny Isakson, James Lankford, Lisa Murkowski, and John Thune.

But, technically, the BATFE cannot regulate bump stocks like automatic weapons.

The ATF may have run into a problem predicted by Rep. Thomas Massie, R-Ky., who leads the Congressional Second Amendment Caucus. Massie told the Washington Examiner this month that under current law, automatic weapons are those that discharge more than one round with a single pull of the trigger,” the Examiner reported.

Bump stocks, he said, speed up the rate of fire, but still require the shooter to pull the trigger once for each round that is discharged. Massie said for that reason, there is no basis under the law to regulate bump stocks,” the Examiner continued.

At least one Republican lawmaker has introduced legislation banning bump stocks.

For the first time in decades, there is growing bipartisan consensus for sensible gun policy, a polarizing issue that has deeply divided Republicans and Democrats,” says Florida Republican Congressman Carlos Curbelo, introducing a bill to criminalize bump stocks.

This common-sense legislation will ban devices that blatantly circumvent already existing law without restricting Second Amendment rights,” he claims.

His bill was introduced with the support of Republican Reps. Peter King, Leonard Lance, Patrick Meehan, Ed Royce, Chris Smith, Erik Paulsen, Ryan Costello, Ileana Ros-Lehtinen and Charlie Dent.