A magazine for an automatic shell-firing weapon mounted on a gun carriage, wherein the magazine is adapted to contain a belt and comprises two closed magazine portions interconnected by a closed transfer channel. The two magazine portions are disposed on opposite sides of the weapon. In a fully loaded state of the magazine, a front section of the belt is disposed in a first magazine portion disposed on a belt supply side of the weapon. The upper part of the first magazine portion has a removal opening that faces the weapon. A rear section of the belt is disposed in a second magazine portion on the opposite side of the weapon. A middle section of the belt is guided through the transfer channel.