WASHINGTON — With Congress slow to restrict bump stocks in the aftermath of the Las Vegas shooting, cities in states from Colorado to Massachusetts are taking matters into their own hands.

But gun control advocates aren't holding their breath for a ban in Texas, where state law prohibits municipalities from restricting firearms and supplies.

“Unfortunately, Texas law actively discourages municipalities and cities from doing the same,” said Lisa Epstein with the Texas chapter of Moms Demand Action for Gun Sense in America. “Given this, we haven't heard of any Texas cities planning to take action to prohibit bump stocks.”

And an influential state legislator said he’s confident that the Legislature would override any city that tried to implement a ban.

Massachusetts became the first state to ban bump stocks in November, one month after the Las Vegas shooting, and New Jersey followed suit last month. Denver and Columbia, S.C., have implemented their own bans. More than a dozen states have proposed legislation, according to Epstein.

Progressive cities like Austin and Houston are not considering a bump stock ban, but even if they tried, gun advocates say their efforts won’t hold up against the Texas Constitution.

Alice Tripp, legislative director for the Texas State Rifle Association, doesn’t expect any cities to attempt their own bump stock ban. The Lone Star State’s law that overrides or pre-empts local governments from regulating firearms is necessary to provide “consistency” across the state,” she said.

“They can’t do anything,” Tripp said about the possibility of efforts by cities. “If we don't have pre-emption, then we have a patchwork of cities or counties that go, ‘No you can’t cross here, no you can’t go there.”

Although state lawmakers could pass their own bump stock ban, the Republican-controlled Texas Legislature isn’t in session for another year.

State Rep. Phil King, a Weatherford Republican and chairman of the House Homeland Security and Public Safety Committee, said he has not heard from his fellow legislators or constituents about any attempts to push a statewide ban on bump stocks, and he’s “confident” that the state would override any attempts by cities to outlaw the devices.

“The cities do not have the authority to regulate firearms,” King said, adding that firearm supplies also can’t be regulated. “It’s just impractical and inappropriate.”

Meanwhile, the possibility of a federal ban by Congress seems unlikely any time soon now that GOP leaders have shoved the problem over to the federal agency that regulates firearms.

A bipartisan measure by Reps. Carlos Curbelo, a Florida Republican, and Seth Moulton, a Massachusetts Democrat, to prohibit the manufacture, sale or use of a bump stock after 90 days seems to have stalled.

Under pressure from Congress, the Bureau of Alcohol, Tobacco, Firearms and Explosives and the Department of Justice announced in December that it would review the aftermarket devices, despite ATF determining in 2010 that they could not be regulated by the agency.

ATF is re-examining whether bump stocks fall in the definition of a “machine gun.” Public commenting for the review ended last month, and the agency received over 35,000 comments.