FYI, i can only see 2 differences between older and newer mags:
1) The sides of the older mags (mag #3 and #4 pic below) have sides that have more of a horizontal lip compared the newer mags (latter pics) which are more flat.
2) New mags have notches on both sides (for ambi magazine release models) where the older mags only have one notch.
I wonder if these differences causes the mags not to seat properly when using older longer mags in newer smaller guns...
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