A modular magazine for a firearm is disclosed. The magazine has a tower and a magazine body. The tower and magazine body are modular and can be disconnected from each other. When disconnected, the tower can be paired with other magazine bodies. Also, the magazine body may be connected to other suitable towers. Different towers may allow a magazine to connect with a plurality of styles of firearm. Also, a plurality of styles of magazine may be used with a single firearm when connected to a suitable modular tower.