(Please Move to Air Gun Forum)

Yeah it's called a perpetual motion machine, when someone finally invents one , all the worlds energy problems will be solved
 
What you're probably looking for is a PCP. (Pre-Charged Pneumatic) They basically have a small compressed air cylinder that holds enough air for a certain number of shots. Usually around 20 or more depending on the size of the cylinder, calibre, and velocity.
 
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