Pump firearm having a forwardly moving barrel

A pump action firearm which includes a barrel, a chassis defining a magazine well for receiving a magazine, the magazine well extending longitudinally parallel to the barrel and operable to contain a magazine that holds a plurality of cartridges arranged in stacked relationship with each cartridge having its longitudinal axis extending substantially transversely to a longitudinal axis of the barrel, a pump member operable to displace the barrel forwardly and rearwardly, and a carrier mechanism linked to the pump member and operable, during pumping of the pump member, to move an end cartridge contained in the magazine from its stacked position to an operative position in alignment with the longitudinal axis of the barrel.