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Since it was a while back I dont remember exactly. I think my goal was to see if I could get the cheapest possible milspec metal AR15 magazine to work. The upper just seemed extra finicky and some worked great and others didnt work well and I put them back on 5.56 duty. I think that probably 75% of the ones I modified worked great and I marked them 50 beo only. So basically test them out one by one to make sure your rifle likes them.Thanks for answering again. We're all your mags of the same variety mil spec metal AR15 variety? I want to make sure I'm understanding what you are saying. If there is one better to modify over the other or if you modified a few of the same type but still experienced feed problems even though they were same type mags to begin with?