WASHINGTON — The Trump administration announced a new regulation Friday that would outlaw “bump stocks,” the mechanical device used by the Las Vegas shooter to make his rifles fire like more lethal automatic weapons.

President Trump announced the regulation in a Twitter message a day before the so-called March for Our Lives, which was organized by young people after the mass slayings at a Parkland, Fla., high school.

Marches are planned for Washington and hundreds of other locales nationwide to call for stricter gun control measures.

Congress has held hearings since the Parkland shootings on Feb. 14, but Republican leaders have shown little interest in passing new laws.

Bump stocks use a semiautomatic rifle’s recoil to allow the stock to slide back and forth with each shot, dramatically accelerating the rate of fire to as much as 800 bullets per minute.

Stephen Paddock used bump stocks in October in the rampage that killed 58 people and wounded hundreds of others in Las Vegas, the deadliest mass shooting in modern American history.


“After the senseless attack in Las Vegas, this proposed rule is a critical step in our effort to reduce the threat of gun violence that is in keeping with the Constitution and the laws passed by Congress,” Attorney General Jeff Sessions said in a statement.

Manufacturers of the devices have letters from the ATF on their websites to reassure customers that the devices are legal.

If the Justice Department rule is made final, owners of bump stocks would be required to turn them in or destroy them, though manufacturers could sue to block enforcement.

In his tweet, Trump castigated the Obama administration for a previous ATF ruling, in effect criticizing his predecessor for not limiting firearms after years in which Trump assailed Obama as opposing gun rights.

“BAD IDEA,” he wrote. “We will BAN all devices that turn legal weapons into illegal machine guns.”

Only subscribers are eligible to post comments. Please subscribe or login to participate in the conversation. Here’s why.

Use the form below to reset your password. When you've submitted your account email, we will send an email with a reset code.