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Bump firing is the act of using the recoil of a firearm to fire multiple shots in rapid succession. This process involves holding the foregrip with the non-trigger hand, 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 stationary. The firearm will recoil and then return to its previous position after the round has been fired first resetting and then pressing forward against the trigger thereby firing successive shots.

The rapid bursts from semi-automatic firearms simulate the discharge of automatic firearms. Even though a large number of rounds are fired in rapid succession, the trigger finger initiates each discharge; therefore, fully automatic fire is not actually taking place.

Devices (from complicated, specially made triggers to the low-tech rubber band) are employed in order to cause or facilitate the “bumping.” However, not all such devices or modifications are legal. A famous example is the case of the Akins Accelerator for the Ruger 10/22. Though the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) initially allowed mechanical devices for producing rapid fire, this ruling has since been reversed and currently the device is illega

It's a little trick to make a semi-auto into an auto. Basically you wrap the rubber band around the trigger and back of the trigger guard to where its almost trips the hammer. Then, when you fire the first shot, the recoil loads the next round, as usual, but the rubber band keeps the trigger from returning back to its firing position. Then, just as the slide cocks the firing pin, the rubber band pulls the trigger back again.

It's like having a hair trigger, where you only need to pull the trigger once.