not much holding it in.....I probably wouldn't use it like that, just posted a pic of what it looks like un-modified....
I mill the ribs out of the 223 mags and they work fine....was working on a mandrel to press the ribs out but never got around to finishing it...
the 7.62x39 mag goes to a 7mm wildcat built on the CZ x39 action....
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Drops right in, no mods needed to mag....