In this Oct. 4, 2017, photo, a device called a "bump stock" is attached to a semi-automatic rifle at the Gun Vault store and shooting range in South Jordan, Utah. The National Rifle Association announced its support Ton Oct. 5 for regulating the devices that can effectively convert semi-automatic rifles into fully automated weapons and that were apparently used in the Las Vegas massacre to lethal effect. It was a surprising shift for the leading gun industry group, which in recent years has resolutely opposed any gun regulations. Immediately afterward the White House, too, said it was open to such a change. (AP Photo/Rick Bowmer)

In this Oct. 4, 2017, photo, a device called a "bump stock" is attached to a semi-automatic rifle at the Gun Vault store and shooting range in South Jordan, Utah. The National Rifle Association announced its support Ton Oct. 5 for regulating the devices that can effectively convert semi-automatic rifles into fully automated weapons and that were apparently used in the Las Vegas massacre to lethal effect. It was a surprising shift for the leading gun industry group, which in recent years has resolutely opposed any gun regulations. Immediately afterward the White House, too, said it was open to such a change. (AP Photo/Rick Bowmer)

WASHINGTON (AP) — It’s not every day — or every year or every decade — you see Republicans raising questions about whether Democrats were tough enough on gun control when they were in power.

Such is the case now as political debate stirs over a regulatory decision approving the use of “bump stocks” like those possessed by the Las Vegas gunman.

Some Republicans are gingerly asking whether the Obama administration was on the ball when it approved the device in 2010. Gingerly, perhaps, because both parties are in some ways complicit in allowing the device to become available to killers even as they seem willing to join now in restricting or banning them.

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A product that can make a semi-automatic weapon fire almost as rapidly as a machine gun was clearly under the radar of political Washington until the massacre of 58 people by a man whose astonishing personal arsenal included bump stocks. Lawmakers in both parties are saying they hadn’t heard of the device until this week or known much about it. “A lot of us are coming up to speed (on) just what this is,” said House Speaker Paul Ryan.

Here’s a sampling of the rhetoric:

KELLYANNE CONWAY, adviser to President Donald Trump: “It was President Obama’s ATF, the Bureau of Alcohol, Tobacco and Firearms, in 2010 that decided not to regulate this device. ... That should be part of the conversation.” — to CNN on Thursday

RYAN, on that agency’s decision: “Was it a regulatory misstep by ATF some number of years ago?” — news conference Thursday

REP. KEVIN McCARTHY, House majority leader: “I do not know why the ATF actually approved this under Barack Obama.” — to Fox News on Thursday

THE FACTS: Yes, approval of the device was an Obama-era decision.

But there’s more. Republicans by and large did not support Democratic legislation that would have restricted bump stocks. Such a provision was contained in a 2013 bill pushed by Democratic Sen. Dianne Feinstein of California.

There’s still more, though. The provision was in a bill that had little hope of GOP support because it sought to restore a ban on certain semi-automatic weapons, a non-starter for many in the GOP.

Legislation often contains pieces that might win bipartisan support if they were not entangled in sweeping measures unpalatable to the other side.

So, in essence, neither party in Congress had the foresight to take a clean run against bump stocks and similar devices before they were put to such lethal use.

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In a June 2010 letter, the Bureau of Alcohol, Tobacco, Firearms and Explosives told the manufacturer that it considered the device to be outside its regulatory jurisdiction, thereby posing no obstacle to its marketing. The bureau noted that the device was intended to help people whose hands have limited mobility and that it had no automatically functioning parts. Constant forward pressure with the non-shooting hand and constant rearward pressure with the shooting hand were required for it to work, the letter said.