US Patent 7267119 Air gun

An air gun including a slide, a barrel, a cylinder portion, a hit pin, a hollow valve pin chamber, a valve body, a gas supply port, a valve pin, a pressing section, a bullet feed nozzle link connected to a trigger; and a bullet feed nozzle. When the hit pin is pressed to the muzzle side and made to slide to the muzzle side, the valve pin slides to the muzzle side against an urging force to release an airtight state between the valve pin flange section and the gun rear end side side surface of the valve pin chamber; compressed gas supplied to the valve pin chamber from the gas supply port is supplied from between the valve pin chamber gun rear end side side surface and the valve pin flange section to the valve pin chamber side opening; and a bullet is fired from the muzzle by passing compressed gas through the bullet feed nozzle insertion section a supplying to the muzzle side of the bullet feed nozzle; and compressed gas is supplied from a clearance between the pressing section and through holes into which the pressing section is inserted to the gun rear end side to cause the cylinder section to move to the gun rear end side.