Had an Elftmann in my main gun, and a CMC in my back up.
After a bunch of screwing around with the Elftmann (including replacement) I now have a CMC in both guns.
I love the idea of these and the fact that they are clear, but I have read about, and seen so many issues with their mags that I don't know if I can get one.
I use the Radian on all my red dot equipped ARs, and the NLA on my PCCs and scope equipped ARs.
I can not get you a measurement for a few days.
Many others here are running both, that may be able to help