Patent ID: 8186086

Claim:
A magazine with an indicator to display the number of cartridges present, said magazine having a magazine housing, and comprising: a) a graduated tape having printed thereupon, a series of numbers representing the number of cartridges present in the magazine; b) an indicator window present in the magazine housing, configured to display the portion of said tape showing an indication of the number of cartridges remaining in said magazine; c) a cartridge advancement spring which is fully contracted when the magazine is full of cartridges and extends in stepwise fashion as each cartridge is expended; d) a cartridge advancement plate affixed to the movable end of said cartridge advancement spring; such that as each cartridge is expended, said cartridge advancement plate draws said graduated tape, and a respective indication of the number of cartridges remaining is displayed upon said tape in said window; and wherein said magazine housing further comprises a graduated tape housing, said tape housing is located beneath said cartridge advancement plate and within the internal space of said cartridge advancement spring.