A gun magazine comprising:
- an outer shell made in the form of a vertically extending double open ended shell;
- an inner shell mounted inside said outer shell, said inner shell comprising a track defined therein, an opening located in a top side thereof in communication with a front end of said track, a locating rod located in an opposing rear end of said track, a spring member mounted in said track, said spring member comprising a first end facing toward said opening and an opposing second end mounted on said locating rod, and a guide block supported on said first end of said spring member and movable in and out of said opening;
- a bottom cover affixed to a bottom side of said inner shell and a bottom side of said outer shell, said bottom cover comprising an elongated slot disposed in communication with said track;
- and
- an adjustment member inserted through said elongated slot of said bottom cover, said adjustment member comprising a retaining tip suspending inside said inner shell, said adjustment member being operable to move said retaining tip between an outer position where said retaining tip is shifted into said track to stop said guide block in a mid part of said track and an inner position where said retaining tip is shifted out of said track for allowing movement of said guide block to the rear end of said track to compress said spring member toward;
- wherein:
- said adjustment member further comprises a lever inserted through said elongated slot of said bottom cover, said lever comprising a top end disposed inside said outer shell and an opposing bottom end disposed outside said outer shell and terminating in an operating tip, a guide rod formed integral with the top end of said lever and terminating in said retaining tip, and a pivot holder formed integral with the top end of said lever and pivotally connected to said inner shell, said operating tip of said adjustment member being operable to move said lever between a first position in one end of said elongated slot and a second position in an opposite end of said elongated slot, said retaining tip being shifted to said outer position when said operating tip is operated to move said lever to said first position, said retaining tip being shifted to said inner position when said operating tip is operated to move said lever to said second position.