Gun rights groups had a sought a hold on the ban, which went into effect on Tuesday. The court denied the second such appeal, allowing the ban to proceed while challenges move through the courts.
Anyone selling or owning bump stocks could face up to 10 years in federal prison and a fine of $250,000. The devices are now classified as machine guns.
The federal ban on bump stocks announced in December takes effect March 26. Sellers and gun rights groups are taking advantage of that extra time to boost sales, despite the upcoming ban.
As the NRA opens its annual meeting Friday, it faces criticism — and not just from gun control advocates. Some gun owners, like Tim Harmsen, are unhappy with the organization's recent compromises.
Slide Fire will stop taking orders and halt manufacturing of the rapid-fire gun products. It is facing a class-action lawsuit for negligence, and the government is pursuing a ban on the devices.
Instead of broader gun control, Gov. Rick Scott wants to keep guns away from mentally ill or violent people. He announced funds for "school hardening" and police officers in every school.
Though America saw the deadliest mass shooting in modern U.S. history in 2017, efforts to enact new gun laws, once again, stalled in Congress.
Bump stocks made headlines in October, when a man used weapons fitted with the attachment in an attack that killed 58 people at an outdoor concert in Las Vegas.