Magazine spring and magazine assembly

A magazine comprising:

• a magazine tube extending along a central axis from a bottom end to a top end having feed lips;
• a follower retained in the magazine tube;
• a base plate on the bottom end of the magazine tube;
• a spring plate with a plate body;
• and
• a spring retained within the magazine tube between the spring plate and the follower, the spring including a top attachment leg, a bottom attachment leg, a plurality of upper coils, and a plurality of intermediate coils between the plurality of upper coils and the bottom attachment leg;
• wherein the spring extends along a central spring axis and individual coils of the plurality of intermediate coils have a rectangular coil shape that includes straight side segments connected between straight end segments, wherein each of the straight side segments and each of the straight end segments is inclined to a horizontal when the spring is at free length with the central spring axis oriented vertically.