Point is, AR mags are disposable/replaceable items. Unless they sit in your closet, they wear out. I have thrown about 15 away in the past 10 years, Pmags and Aluminum GI. Fortunately, I started to pick up Lancer and C-Products mags in the past few years for use in the .450 BM. They work so well, about half my stock is now with steel lips.

I picked up maybe a dozen Brownells/PMags a year at matches for the past few years and had been giving them away. Kind of wish I now had all those back.