I like to keep my AR mags loaded all the time for whatever SHTF scenario you wanna think of I keep 20 in the standard 30 rounders is that to many to keep loaded I dont wanna have to rebuild my mags cause I did that should I just not keep them loaded or is there a golden number I can get away with without weakening the spring. ive had the factory mag for 2 years now and it dont work now but my brownell mags work just fine whats your