That could happen as soon as next week.
Senator Charles E. Grassley of Iowa, chairman of the Judiciary Committee, announced Monday night that the committee will convene a hearing on bump stocks on Tuesday. The witness list has not been made public, but bureau officials are expected to testify.
The desire to ban bump stocks still exists on Capitol Hill, even if it is quieter. Senator Dianne Feinstein, Democrat of California, has proposed legislation banning bump stocks and has more than three dozen co-sponsors, all Democrats.
Twelve of the rifles the gunman had in his hotel room were outfitted with a “bump stock,” an attachment that enables a semiautomatic rifle to fire faster.
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At least two Republicans, Senators John Cornyn of Texas, the No. 2 Republican, and Lindsey Graham of South Carolina, said they would be open to banning the devices, depending on what bureau officials say at next week’s hearing.
“If you believe that automatic weapons should be highly regulated and limited, then why would you be against banning a device that makes a gun an automatic weapon?” Mr. Graham said.
But Congress will likely have to stir from its stupor on guns if lawmakers want bump stocks off the market. The A.T.F. has deemed bump stocks “a firearm part” not subject to regulation under federal laws that, since the 1930s, have sharply limited the manufacture and possession of fully automatic weapons.
The N.R.A. was actually the first to put the onus on the A.T.F. In a statement after the Las Vegas shooting, the powerful gun lobby said the bureau should revisit the bump stock issue, and “immediately review whether these devices comply with federal law.” That was hailed by some as a change for the group, but in fact, the N.R.A. never embraced a ban.
In a recent interview on YouTube with James Yeager, a Tennessee gun enthusiast who runs a firearms training business, the association’s chief lobbyist, Chris Cox, bragged about its head fake.
“The day before we put out that statement there were enough votes in the House of Representatives, the pro-gun Republican House of Representatives, to pass a Feinstein-Curbelo type of bill,” Mr. Cox told Mr. Yeager. He went on: “The truth is we needed to slow down the process and have an educated conversation.”
What the N.R.A. calls an educated conversation, gun safety advocates regard as slow-walking.
“I don’t think the N.R.A. has killed it, but they have certainly put the brakes on,” said John Feinblatt, president of Everytown for Gun Safety, a national advocacy group. “Their original statement was a wink and a nod by saying that it should be something that A.T.F. looked at. They knew very well that actually that was an effort to divert attention from legislation.”
To Democrats who support the ban, the bump stocks debate follows a depressingly familiar pattern.
“Every time there’s a gun massacre, we have outrage, grief and silence, and that’s what’s happened here,” said Senator Richard J. Durbin of Illinois, the No. 2 Democrat. “It happens again and again and again, and this situation is so obvious. It’s a simple fix. And when the National Rifle Association said, ‘We don’t want to see legislation’ — end of story.”