I used to about once every two months take the mag. apart. the spring should extend 1/2 the distance out of the mag. the spring should have a total of 1 1/2 the length of the mag. if it doesnt you can stretch it by hand. it seems strange but i have several mags that stay loaded , some i have had 12 years and still going. this will also help jamming . compressed mag springs are the #1 reason for jams,missfeeds or stovepipes. try it . by the way i was taught to do this in a firearms instructors class. i didnt think this up.