Abstract: The cylindrical bottom end of the magazine is embodied in two distinct sections, upper and lower, which remain united during operation; the upper section is rigidly associated with the main body of the magazine, whilst the lower section is anchored permanently on one side to the frame of the machine by way of a sliding and hinged bracket that can be retracted sideways from a first limit position, in which the two sections are stably and coaxially aligned, to a second limit position in which the lower section is distanced from the upper section to a point where it can be rotated clear.