While the fact of my magazines being constantly loaded to "Max" for the past 7 years hardly compares to that of the WWII magazines, it does present sufficient time to assure that time compressed does not bring about significant or meaningful decrease of the springs' functional integrity. In terms of the "myth" coming in, I believe that it is not "myth", but "marketing". We are told by those who would sell us "rebuild kits" for our magazines that we "need them". Not! I have never rebuilt any magazine, and all of my magazines still function fine. This was a fantastic thread! Thank-you all! Save your money for something more significant--more magazines, not more magazine springs.