A rifle design that places the receiver and magazine of the weapon behind the grip and trigger rather than in front, which makes the weapon more compact while keeping a normal barrel length to maintain accuracy.

a rifle in which the mechanism is laid out to reduce the overall length of the weapon. The magazine is generally located behind the pistol grip and the receiver is set against the firer's shoulder.

Design of assault rifle. Places the ammunition magazine behind the firing hand thus shortening the overall length of the weapon.

A rifle configuration in which the action and magazine are located behind the trigger. This is done so the length of pull is shorter than it otherwise would be, but is controversial because it puts the receiver very close to the shooter's face.

A design methodology for rifles'Bullpup' rifles such as the AUG and the British SA80 have the magazine and firing mechanism set behind the trigger and grip, instead of the more traditional layout where the magazine is in front of the grip (see the M16, AK47, G36, etc...).  This results in a much longer barrel without increasing the length of the gun, which increases accuracy without making the gun difficult to carry.