The present invention relates to a bullpup-type gun with a barrel positioned at the bottom, in which the bullpup-type gun basically has a bullpup-type shape, and a barrel, a loading handle, and a shell discharge part are provided at a lower side of a body part, which may prevent burns and injuries to a user caused by a configuration in which a shell is discharged upward, and a height difference between a front sight and a rear sight may solve a problem with an aiming degree caused by a configuration in which the barrel is disposed at the bottom.

The present invention relates to a bullpup-type gun with a barrel positioned at the bottom, in which the bullpup-type gun basically has a bullpup-type shape, and a barrel, a loading handle, and a shell discharge part are provided at a lower side of a body part, which may prevent burns and injuries to a user caused by a configuration in which a shell is discharged upward, and a height difference between a front sight and a rear sight may solve a problem with an aiming degree caused by a configuration in which the barrel is disposed at the bottom.

A handguard exhaust structure of a firearm includes: a barrel, a piston mechanism parallelly arranged with the barrel in a length direction and a positioning end, a sleeve extended from the positioning end, and a piston member actuating within the sleeve, two exhaust holes are respectively disposed at two sides of the sleeve and arranged to be adjacent to the positioning end; and a handguard allowing the barrel and the piston mechanism to be disposed therein, two divergent stoppers are respectively disposed on the handguard at locations corresponding to the two exhaust holes, each of the divergent stoppers is formed along a length direction of the handguard, a lower diverter hole and an upper diverter hole penetrating the handguard are disposed at two sides of each of the divergent stoppers. Accordingly, effects of lowering the temperature and prevent hands from being burnt are achieved.

A handguard exhaust structure of a firearm includes: a barrel, a piston mechanism parallelly arranged with the barrel in a length direction and a positioning end, a sleeve extended from the positioning end, and a piston member actuating within the sleeve, two exhaust holes are respectively disposed at two sides of the sleeve and arranged to be adjacent to the positioning end; and a handguard allowing the barrel and the piston mechanism to be disposed therein, two divergent stoppers are respectively disposed on the handguard at locations corresponding to the two exhaust holes, each of the divergent stoppers is formed along a length direction of the handguard, a lower diverter hole and an upper diverter hole penetrating the handguard are disposed at two sides of each of the divergent stoppers. Accordingly, effects of lowering the temperature and prevent hands from being burnt are achieved.