Patent ID: 9562738
Date: 2017-02-07
CPC Classifications: F41B

Claim:
1. An airgun comprising: (a) a barrel; (b) a compression tube having transfer port fluidly connected to the barrel; (c) a compression piston at partially disposed within the compression tube and moveable within the compression tube between a first position and a second position, the compression piston having a piston body and a piston head, the piston head being longitudinally displaceable relative to the piston body during movement from the first position to the second position; (d) a seal connected to the piston head and forming a sealed interface with an inside surface of the compression tube; (e) a spring contacting the compression piston, the spring repeatably moveable between a cocked position and a fired position, wherein the compression piston is in the first position in the cocked position of the spring and the compression piston is in the second position in the fired position of the spring; and (f) a radially expandable bushing connected to the piston body, the bushing radially expanding from a non contacting configuration to a contacting configuration in response to a longitudinal compressive force on the bushing, the longitudinal compressive force corresponding to movement of the spring from the cocked position to the fired position and the radial expansion of the bushing in the contacting configuration sufficient to contact the inside surface of the compression tube.