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A type of non-handgun firearm configuration where the action is located behind the trigger group/housing and alongside the shooter's face, instead of in front as in conventional designs. This permits the weapon to be shorter for the same barrel length, improving maneuverability and reducing weight.

Basically, in a normal gun, the magazine (weapon) is in front and the trigger is behind. In a bullpup firearm, the trigger is in front and the magazine is behind.