Bullpup

Bullpup is a firearm configuration in which the action and magazine are located behind the trigger. This increases the barrel length relative to the overall weapon length, permitting shorter weapons for the same barrel length, saving weight and increasing maneuverability. It alternatively allows for longer barrels on weapons of the same length, which can increase muzzle velocity. Higher muzzle velocities result in flatter trajectories, a longer effective range, and, in some cases, increased lethality.