LAS VEGAS: The man who unleashed hundreds of rounds of gunfire on a crowd of concertgoers in Las Vegas had two accessories that could have allowed his semi-automatic rifles to fire rapidly and continuously, as if they were fully automatic weapons, officials said.

Although legally and widely available, the so-called “bump stocks” have attracted scrutiny from authorities and lawmakers in recent years.

California Senator Dianne Feinstein has long railed against them. Several years ago, she had expressed concern about the emergence of new technologies that could retrofit firearms to effectively make them fully automatic.

“This replacement shoulder stock turns a semi-automatic rifle into a weapon that can fire at a rate of 400 to 800 rounds per minute,” she said.

A semi-automatic weapon requires one trigger pull for each round fired. With a fully automatic firearm, one trigger pull can unleash continuous rounds until the magazine is empty. The “bump-stock” devices work by manipulating the trigger mechanism extremely rapidly, far faster than a person could do so without them.

Two officials familiar with the investigation said Stephen Paddock had two bump stocks in his hotel room. They are investigating whether those items were used to modify weapons used in the massacre, according to the officials, who were briefed by law enforcement.

Witnesses and law enforcement official said the quick, 50-round bursts of gunfire raised the possibility that Paddock had used a fully automatic weapon or modified his semi-automatic rifles to function like one. The Las Vegas shooter had 23 guns in his hotel room. Yet the purchasing of fully automatic weapons has been significantly restricted in the US since the 1930s.

In 1986, the federal National Firearms Act was amended further to prohibit the transfer or possession of machineguns by civilians, with an exception for those previously manufactured and registered. Numerous attempts to design retrofits failed until recent years when bump stocks came on the market.

The device basically replaces the gun’s shoulder rest, with a “support step” that covers the trigger opening. By holding the pistol grip with one hand and pushing forward on the barrel with the other, the shooter’s finger comes in contact with the trigger.

Published in Dawn, October 4th, 2017

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