A system and method for using a firearm magazine are described. One example includes a firearm magazine assembly. The assembly has a housing defining a cartridge track, the housing having a distal end having feed lips for feeding cartridges to a firearm and a proximal end. The assembly also has a follower assembly having a follower and a spring. The follower has a proximal side and a distal side and is movable between a compressed position and an extended position. The follower engages the housing in the extended position without biasing the feed lips away from each other, whereby the follower prevents creep of the distal end of the housing when the follower is in the extended position.