Patent ID: 8011355

Claim:
A cartridge-based air gun comprising: a clip, which vertically loaded with plural cartridges that are each horizontally oriented, and a gas reservoir provided inside a magazine that is provided separately from a body of the gun, the magazine detachably loaded in a magazine chamber provided in a grip of the body of the gun; a chamber provided between a rear end of an inner barrel, which is provided in a barrel of the body of the gun, and a front end of a cylinder, which is so provided as to be movable forward and rearward inside a slide that is capable of moving forward and rearward on an outer circumference of the inner barrel; an uppermost cartridge in the clip in the magazine loadable to the chamber by being urged by a spring force of a follower spring provided within the clip; each of the plural cartridges configured as to hold a bullet in a through-hole provided therein and to be friable forward by compressed gas that is supplied from behind; wherein after the bullet loaded in the cartridge is fired by the compressed gas supplied from the gas reservoir, a spent cartridge is automatically ejected when the slide automatically moves rearward due to the compressed gas that fills the cylinder; an extractor that engages with a rim, which is formed at a rear end of the cartridge loaded in the chamber, pivotally provided on a side portion of the cylinder so as to be rotatable, and a claw portion formed at a tip of the extractor able to engage with the rim of the cartridge by means of an urging force of a spring provided between the extractor and the cylinder, wherein as the slide moves rearward while the cartridge is held inside the chamber and as the cylinder moves rearward with the stopping of the supply of the compressed gas from the gas reservoir, the cartridge comes into contact with the ejector and is ejected from the chamber, and wherein by providing a gap of at least 1 mm between a rear end of the cylinder and a rubber packing provided on an outer circumference of a front end of a piston, blowback of the slide is performed quickly by discharging at once through the gap the gas that fills the cylinder.