Bump firing is a technique used to rapidly fire a semi-automatic firearm by using the recoil of the gun to bump the trigger. This technique is often used to simulate fully automatic fire, but it is important to note that bump firing is not the same as fully automatic fire.
Bump firing can be dangerous and can damage your firearm, so it is important to only use this technique with caution. If you are not familiar with bump firing, it is best to consult with a qualified firearms instructor.