WASHINGTON—House Republicans said Tuesday they don’t expect legislation that would make it easier to buy gun silencers to come to the House floor in the aftermath of this week’s shooting in Las Vegas.

Some Democrats, meanwhile, pushed to end the sale of “bump stocks,” devices that increase the rate of fire on a semiautomatic rifle. Law-enforcement officials said the Las Vegas gunman had at least one of his guns outfitted with such a device.

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