Bumpfire
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Bumpfiring is the act of using the recoil of a firearm with a stock to fire multiple rounds in rapid succession. This process is achieved by holding the weapon in a normal firing position, releasing the grip on the firing hand (leaving the trigger finger in its normal position), pushing the rifle forward in order to apply pressure on the trigger finger from the trigger, and keeping the trigger finger near the same position. Since the firearm will recoil against the shoulder and then return to its previous position after the round has been fired -- thus pushing the trigger against the trigger finger again -- large bursts can be fired.
The main reason this practice is done in the United States is because the rapid bursts from semi-automatic firearms simulate automatic weapons which were regulated and banned by the National Firearms Act and the Firearm Owners Protection Act, respectively. Even though a large number of rounds can be fired in quick succession like a machine gun, technically the trigger finger initiates each discharge; therefore, the action of the weapon is not automatic.
In order to make this procedure easier, devices from cleverly rigged shoestrings to specially designed stocks have been created. The most famous was the Akins Accelerator[1] for the Ruger 10/22. Though the BATFE initially allowed devices aiding in this process, this ruling has since been reversed.[2]
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