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ATF Says Las Vegas Shooter Used Bump Fire Stock

We now know that Stephen Paddock, the Las Vegas shooter, did not use fully automatic rifles nor machine guns. Experts from the Bureau of Alcohol, Tobacco and Firearms, ATF, have examined the weapons found in Paddock′s suite at the Mandalay Bay Resort Hotel and Casino. Of the 23 weapons found, many were the civilian, semi-automatic variants of the AR-10 and AR-15 rifles. Of these, a dozen were equipped with either a Bump Fire Stock or SlideFire system. These are after-market devices which adapts to the factory shoulder stocks of these highly modular rifles. With a BumpFire or SlideFire device, a shooter may fire rounds far more rapidly, nearly simulating the same as a military, full-automatic weapon.




The SlideFire system has been around for a while and generally cost around $300. The BumpFire is newer and costs about $99. The system works using the recoil caused by firing the rifle. The BumpFire and SldieFire systems are attached to the factory or after-market stocks of the rifle. These devices are spring-loaded, such that as each round is fired, they basically cause your finger to work the trigger at a more rapid rate than normal. Such modified rifles also require a forward hand grip in order to maintain a consistent pressure of the rifle into your shoulder. Without this pressure, you would only fire one round before pausing.



Early fully automatic weapons used the recoil action, too, known as the ′blow-back system′. In these weapons, the whole upper assembly, from barrel to firing chamber housing, is pushed back into a firing position with a spring. The action reloads a new round from the magazine with each recoil. Gas-operated automatic weapons perform the same function, but use excess gases from the explosion of each round to work the mechanism. Some of these weapons use a gas-operated piston, which is more efficient and prevents dirt from interfering with the weapon firing.


In reviewing the video recordings during the Las Vegas shooting, it is clear that the shooter, Stephen Paddock, was using these devices. You can hear each individual round being fired, whereas with a true, fully automatic weapon, you would be unable to distinguish individual rounds. Since these devices are still technically semi-automatic, they are considered legal by the ATF. Naturally, the anti-gun crowd are calling for these devices to be banned. So, mu guess is that now that they have become infamous, the BumpFire and SlideFire systems will be selling like hot cakes, flying off shelves of gun stores.


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