Patent ID: 8752317

Claim:
A magazine for a firearm, the magazine comprising: an elongated housing having an internal chamber defined by a wall, a closed end defining a bottom and an open end at a top defining an exit, the internal chamber capable of holding a plurality of cartridges, the elongated housing defining a vertical slot through the wall; the closed end having a removable cover that provides access to the internal chamber; a platform capable of vertical movement within the internal chamber; a carriage that urges the plurality of cartridges towards the exit of the elongated housing; a spring comprising a plurality of removable spring segments, the spring located between the platform and the carriage; a c-shaped member fixed to each removable spring segment in the plurality of removable spring segments, said c-shaped member configured to slidably receive another removable spring segment so as to link the plurality of removable spring segments together in approximate alignment on an axis within the elongated housing; and a thumb slide extending through the vertical slot into the internal chamber and connected to the platform, the thumb slide operable within the vertical slot to move the platform vertically within the internal chamber.