I assume we are not talking about pistols here, as I always treat them different then I would other magazines, especially if they seem to work well in my pistol.
I wonder if the Clinton assault weapons ban and magazines restricted to 10 rounds could have anything to do with the Army's accountability mentallity in CONUS prior to the lifting of the ban. I suspect that 30 Rd Mags would have sold for a good price in those days.