Bump-Stock Device Received ATF Green Light During Obama Administration

By Susan Jones | October 4, 2017 | 11:19am EDT
This photo, taken from a video posted on the Slide Fire website, shows the after-market bump stock device, which uses the gun's recoil to cause rapid discharge of bullets.

(CNSNews.com) - On June 7, 2010 -- about a year and a half into the Barack Obama administration -- the Bureau of Alcohol, Tobacco, Firearms and Explosives issued an opinion letter, giving the go-ahead to an after-market accessory that allows the user to “bump fire” a semi-automatic rifle.

A company called Slide Fire had earlier sent its patented replacement shoulder stock to ATF’s Firearms Technology Branch, asking for an evaluation of the device.

The ATF, in reply, wrote: “Your letter advises that the stock (referenced in this reply as a ‘bump stock’) is intended to assist persons whose hands have limited mobility to ‘bump fire’ an AR-15 type rifle.”

The device replaces the factory stock and grip. The replacement stock moves back and forth with the gun's recoil, allowing it to fire rapidly and continuously as the trigger repeatedly is bumped into the shooter’s finger. A switch allows the user to select semi-automatic fire (one shot for each trigger pull) or the more rapid “bump fire.”

According to the ATF’s June 2010 letter: “The stock has no automatically functioning mechanical parts or springs and performs no automatic mechanical function when installed. In order to use the device, the shooter must apply constant forward pressure with the non-shooting hands and constant rearward pressure with the shooting hand. Accordingly, we find that the ‘bump stock’ is a firearm part and is not regulated as a firearm under the Gun Control Act or the National Firearms Act.”

Slide Fire has posted a copy of the approval letter on its website.

The company also notes, “By definition, our current rifle stocks are not adjustable stocks or trigger manipulation devices.”

An ATF agent told CBS News that the Las Vegas shooter had equipped 12 of the rifles found in his hotel room with bump stocks.

Sen. Dianne Feinstein (D-Calif.) said on Tuesday that she intends to introduce legislation to close what she calls the “automatic weapon loophole,” and some Republicans have indicated they may be open to the idea of banning after-market devices that allow semi-automatic weapons to simulate automatic fire.

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