Bought a batch of these for my PTR 91. Looks like they came in all sorts of packing (some are probably repacks). These are supposedly unissued, and they look that way except for some minor corrosion on a couple floorplates. Manufacturers are both HK and Rheinmetall, and dates are all the way from the early 1960's up through 1989.
Were the steel mags considered too expensive or otherwise unsatisfactory?