Out of interest, I measured three values near the center of the feed lip gap, and averaged them. I have three mags, two that came with the gun (C-1 and C-2) purchased mid-this year, and one (R-1) purchased off the shelf at a LGS in Venice FL this summer:
C-1 - 0.329"
C-2 - 0.334"
R-1 - 0.329"
So mag C-2 is "different", in that it's feed lips measure slightly bigger than the other two. My question is, would 0.005" difference in feed lip gap cause a 115 JHP to nosedive in a Glock 48?