I just bought two 16rd'ers. They both drop free when full. They are however slightly thicker. They are pretty tight coming in and out of my mag pouch whereas the 15rd'ers pull in and out easily. Weird.
I just found one of mine that has become a bit too snug and one of my wifes did it in the past. After using a machinist square on it and doing some measurments, I found that it was ever so slightly our of square. I used a bar clamp on it to re square it and they seem to be just fine now. I sure wish some company would make stiffer and more resilient mags for us. See my flimsy mag post for another solution.
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