Patent ID: 7059316

Claim:
A shooting structure comprising a cartridge and a percussion device engaged with the cartridge, the shooting structure provided for receiving at least one paintball for a paintball gun; the cartridge being a cylindrical body and having therein a pressure chamber and at least one paintball feeder, the pressure chamber and the paintball feeder being defined along an axial direction in the cartridge, the pressure chamber having a gas injection inlet with a non-return mechanism formed on a front end of the cartridge for injecting compressed gas and a decompression opening defined in a rear end of the cartridge, each paintball feeder having a paintball inlet in the rear end of the cartridge and a paintball outlet at the front end of the cartridge; and the percussion device comprising: a cylindrical plug having a plug head formed on a front end of cylindrical plug, a receiving room defined therein for communicating an open rear end of the plug, and multiple receiving holes extending through the plug and arranged around an annular surface of the plug, the plug head set into the decompression opening to attain a hermetic condition, each receiving hole having at least one ball therein which is partially emerged out of an inner face of the plug; a spring received in the receiving room of the cylindrical plug; a firing pin being a tubular object and provided with a flange formed on a front end of the firing pin and an impact section formed on a rear end of the firing pin, a radial dimension of the flange being nominally larger than a dimension of an inscribed periphery formed by emerged portion of the balls received respectively in the receiving holes and around the plug; and an outer sheath having an open front end for engaging with a rear portion of the cartridge and a closed rear end with a through hole defined therein and, a cross-section of the through hole being smaller than a cross-section of the impact section such that the impact section is abutted against the closed end of the outer sheath; wherein an annular section is defined in an inner rear portion of the outer sheath to receive the plug to slide therein and extendedly frontward forming a trough face with a radial dimension in the most front portion thereof to envelop the decompression opening and the paintball inlet at the rear end of the cartridge; wherein the flange in the front end of the firing pin shores up the balls in the plug; the impact section of the rear end of the firing pin is abutted against the through hole portion of the outer sheath; the spring received in the plug compresses rearward the flange; and the plug is limited between the rear end of the cartridge and the annular section.