Helical drum magazine

A magazine, comprising:

• a shell, having an inner space in a shape of cylinder;
• a bullet limiting column, which is in a shape of cylinder, provided in said inner space, and coaxial with said inner space, wherein a bullet space is defined between said bullet limiting column and an inner wall of said shell for receiving bullets;
• a bullet guide rail, spirally winding around said bullet limiting column, wherein a moving channel for said bullets to move along is defined by said bullet guide rail in said bullet space, said moving channel has a first end and a second end, said shell has an opening, said first end of said moving channel is connected with external space through said opening, and bullets enters into or gets out of said magazine via said opening;
• and
• a first spring, provided in said moving channel, wherein a first end of said first spring is provided at said second end of said moving channel;
• when said magazine is empty, said first spring is relaxed, and a second end of said first spring extends to said first end of said moving channel;
• when said bullets are put in said magazine from said opening, said bullets push said second end of said first spring to move towards said first end of said first spring along said moving channel, in such a manner that said first spring is compressed;
• when said bullets are needed, because of an elastic force of said first spring, said second end of said first spring pushes said bullets to move towards said first end of said moving channel, and then get out of said magazine.