A Democratic proposal to ban a special accessory known as a bump stock, which allows semi-automatic guns to fire several hundred rounds a minute, is gaining unexpected support from Republicans in both chambers.

It’s the first time gun-control legislation has picked up significant Republican support since immediately after the Sandy Hook Elementary School shooting in late 2012. Bump stocks were allegedly used by the gunman who killed 59 people at a Las Vegas concert Sunday.

While some GOP members are backing the Democrat-sponsored measure, the effort has many hurdles to clear. To become law, it would have to be embraced by Republican leaders on Capitol Hill and President Trump, who was endorsed by the powerful National Rifle Association (NRA) last year.

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Rep. Bill Flores William (Bill) Hose FloresPatient Protection Pledge offers price transparency Texas GOP lawmaker calls for 'carbon neutral' but 'energy dominant' future OVERNIGHT ENERGY: Biden calls climate change one of America's four major crises | National parks chief says coronavirus staff shortages shouldn't prevent access | Trump hits California officials over wildfires MORE (Texas), a former Republican Study Committee chairman, was the first Republican in Congress to publicly endorse a ban on bump stocks.

“I think they should be banned. There’s no reason for a typical gun owner to own anything that converts a semi-automatic to something that behaves like an automatic,” Flores, a gun owner, told The Hill in an interview just off the House floor.

“Based on the videos I heard and saw, and now that I’ve studied up on what a bump stock is — I didn’t know there was such a thing — there’s no reason for it,” he said.

“I have no problem from banning myself from owning it.”

Gun-rights advocates argue that rapid-fire weapons are fun to shoot and are used regularly by law-abiding citizens without incident.

A bump stock is a sliding stock that when pressed against a shooter’s shoulder allows a semi-automatic gun to shift backward and forward with the recoil of each shot fired. It allows a shooter to fire as many as 400 to 800 rounds a minute with a single squeeze of the trigger, as the sliding action of the rifle replaces the need to contract the index finger.

Until Monday, few lawmakers on Capitol Hill had ever heard of the device.

Flores was joined by several House Republican moderates, including Reps. Charlie Dent (Pa.), Ryan Costello (Pa.), Leonard Lance (N.J.) and Pete King (N.Y.), in saying it should be banned.

“I’m ready to say that they should not be in public use. I think they are a problem. I support a ban on bump stocks. I don’t see any purpose for them,” Dent told The Hill.

“The law is clear to me that automatic weapons are banned in this country, as they should be,” he added.

Costello said, “Purchasing bump stocks off the shelf, enabling a semi-automatic firearm to replicate an automatic one, is a loophole that needs to be closed.”

Lance, who represents a district that Hillary Clinton Hillary Diane Rodham ClintonWhat Senate Republicans have said about election-year Supreme Court vacancies Bipartisan praise pours in after Ginsburg's death Trump carries on with rally, unaware of Ginsburg's death MORE won last year, stated, “Bump stocks should be banned. Fully-automatic weapons are already illegal in this country so any mechanism that essentially converts semi-automatic firearms into fully automatic weapons should also be illegal.”

King previously co-authored legislation with Rep. Mike Thompson (D-Calif.) to expand background checks to cover all commercial firearm sales, including those purchased at gun shows and online.

Rep. Carlos Curbelo (R-Fla.), who also represents a district that Clinton won, said Wednesday that he will introduce legislation to ban bump stocks in the next few days.

Persuading Speaker Paul Ryan Paul Davis RyanKenosha will be a good bellwether in 2020 At indoor rally, Pence says election runs through Wisconsin Juan Williams: Breaking down the debates MORE (R-Wis.) to schedule a vote on legislation banning bump stocks could be difficult, however.

Until Sunday’s mass shooting in Nevada, House Republican leaders were planning to advance a gun-rights bill. The Sportsmen’s Heritage and Recreational Enhancement Act would loosen restrictions on silencers and armor-piercing ammunition, two proposals strongly opposed by gun-control advocates.

Ryan said Tuesday that the bill is now off the schedule.

In the Senate, Homeland Security Committee Chairman Ron Johnson Ronald (Ron) Harold JohnsonThe Hill's Morning Report - Sponsored by The Air Line Pilots Association - White House moves closer to Pelosi on virus relief bill Second GOP senator to quarantine after exposure to coronavirus GOP-led panel to hear from former official who said Burisma was not a factor in US policy MORE (R-Wis.) on Wednesday said that he too would support banning bump stocks.

He views the relatively cheap accessory, which costs between $140 and $300, as a loophole to the 1986 law that heavily restricted the sale and possession of machine guns.

“The fact that fully-automatic weapons are already illegal and this makes another weapon capable [of automatic fire], I would be supportive of that,” Johnson said when asked Wednesday about a proposed bump-stock ban.

Sen. Dianne Feinstein Dianne Emiel FeinsteinMcConnell says Trump nominee to replace Ginsburg will get Senate vote Top Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence Intensifying natural disasters do little to move needle on climate efforts MORE (Calif.), the ranking Democrat on the Judiciary Committee, is spearheading the plan and circulated a summary of it at a lunch meeting with Democratic colleagues Tuesday.

The proposal appears to have as much early momentum as the bill to expand background checks that came to the Senate floor in the wake of the 2012 Sandy Hook school shooting in Connecticut.

That measure narrowly failed by a vote of 54 to 46 — six votes short of the number needed to end a filibuster.

Since then, gun-control legislation has had little momentum in Congress.

Johnson said it’s a straightforward call “unless I’m missing something here, but I don’t think I am.”

“To me that’s already illegal,” he said of unregulated sales of machine guns. “So you shouldn’t have anything that facilitates that so easily.”

Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE (R-Ky.), however, hasn’t shown any appetite to jump immediately into a debate over gun-control legislation.

“The investigation has not even been completed, and I think it’s premature to be discussing legislative solutions if there are any,” he told reporters Tuesday.

The NRA hasn’t commented publicly on legislation that would ban bump stocks.

Lawmakers are scrambling to learn more about the devices.

Sen. Susan Collins Susan Margaret CollinsSenate Republicans face tough decision on replacing Ginsburg Democratic senator calls for eliminating filibuster, expanding Supreme Court if GOP fills vacancy What Senate Republicans have said about election-year Supreme Court vacancies MORE (R-Maine) said she watched videos of rifles firing hundreds of rounds per minute to understand how the special stock works.

“It appears very troubling that this accessory can be purchased so easily and be used to massively increase the firepower of a rifle,” Collins told reporters.

Senate Republican Whip John Cornyn John CornynBipartisan praise pours in after Ginsburg's death Chamber of Commerce endorses McSally for reelection Airline job cuts loom in battleground states MORE (Texas) on Tuesday said the Judiciary Committee should hold hearings on the issue.

“I think we need a hearing in the Judiciary Committee. I know everyone thinks they have all the information they need but I think that needs to develop as part of this investigation,” he said.

Stephen Paddock, who police say opened fire on a crowd of 22,000 people from the 32nd floor of the Mandalay Bay hotel in Las Vegas, was found with 12 rifles outfitted with bump stocks in his suite. Police say Paddock killed himself as authorities closed in on him.

Senate Republican Conference Chairman John Thune John Randolph ThuneWhat Senate Republicans have said about election-year Supreme Court vacancies The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump contradicts CDC director on vaccine, masks MORE (S.D.), the third-ranking member of the GOP leadership, said that several Republicans have expressed interest in restricting bump stocks.

“It’s worth having a conversation about and some of our members agree with that,” he said.

The strong bipartisan interest for a debate on banning bump stocks could set up a fight with GOP leaders later this year.

Senate Democratic Whip Dick Durbin Richard (Dick) Joseph DurbinMcConnell focuses on confirming judicial nominees with COVID-19 talks stalled Senate Republicans signal openness to working with Biden Top GOP senator calls for Biden to release list of possible Supreme Court picks MORE (Ill.) questioned whether McConnell would allow votes on gun-control legislation.

Senate Democrats could try to force a vote on bump-stock restrictions, background checks and other measures during the wide-open vote-a-rama that accompanies the budget resolution, which is due to come to the floor later this month.

Amendments attached to the budget are nonbinding, but a strong vote in favor of banning bump stocks could put pressure on GOP leaders to allow a vote on a binding amendment later this year.

House Democrats could launch a discharge petition, but they would need 218 signatures to force a vote on the floor. That would require all Democrats and 24 Republicans to buck their leaders.

Trump this week has indicated a willingness to discuss gun laws, but has said now is not the time. On the campaign trail last year, Trump went against the NRA by backing bipartisan legislation that would prevent people suspected of terrorist ties from buying or owning guns. Since winning the election, he hasn’t called on Congress to act on the bill.