LAS VEGAS, NV - OCTOBER 01: human being scramble for shelter at the route 91 Harvest nation music festival after obvious gun fire to be heard on October 1, 2017 in ras Vegas, Nevada. A gunman has opened fire top top a music festival in ras Vegas, leaving at least 20 civilization dead and an ext than 100 injured. Police have shown that one suspect has actually been shot. The investigation is ongoing. (Photo by David Becker/Getty Images)

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By: note Saunders, script
Posted at 8:20 PM, Oct 03, 2017

While investigators reveal more information regarding the firearms found in a Mandalay just hotel room complying with Sunday"s terrible shooting in ras Vegas, questions about the modifications to the weaponry surfaced.

You are watching: Bump fire stock how it works

Since the shooting, it"s beenrevealed the a machine called a "bump-fire stock" was uncovered on firearms discovered in suspected shooter Stephen Paddock"s hotel room.

A bump-fire stock "uses the recoil of a semi-automatic firearm come fire many shots in fast succession," according to the agency Slide Fire, i m sorry manufactures the specializedstocks.

A semi-automatic weapon have the right to only fire one shooting per cause pull. Bump-fire stocks permit semi-automatic firearms to mimic automatic guns by bumping the trigger - utilizing the recoil the the total bouncing backward v each shot - into the user"s finger.

As the cause bumps into the user"s finger, this create a greater rate of fire. The user doesn"t must manually pull down on the firearm"s trigger. The user simply needs to press forward ~ above the front fixed to press the create into their finger as recoil bring away over.

Bump-fire stocks space legal. Providers such together Slide Fire have said that the stocks do not contain any mechanical parts and thus execute not transform a firearm"s duty to fire automatically. Instead, the deviceallows because that "an alternating shooting technique," creating, "reliable quick fire," follow to slide Fire.

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Jill Snyder, ATF san Francisco field division special agent, said Tuesday that the bump-fire stocks situated in Paddock"s room to be legal:

"The ATF Firearms and Ammunition Technology department provides determinations on gadgets such together bump fire stocks and also their legality. The category of these gadgets depends on even if it is they mechanically alter the duty of the firearm come fire fully automatic. Bump fire stocks, when simulating automatically fire, carry out not actually change the firearm come fire automatically, making lock legal under present federal law."

Investigators Tuesday stated 12 bump-fire stocks were found on firearms uncovered at the scene. Police reported recovering 23 guns in Paddock"s hotel room, though officials are still working to determine which weapons were used in the shooting.